Crystal Kay discography

Crystal Kay discography
Kay in 2008
Studio albums	12
EPs	3
Compilation albums	5
Singles	55

The discography of Japanese contemporary R&B singer Crystal Kay consists of 12 studio albums, three extended plays, five compilation albums, four video albums and numerous single releases. Crystal Kay debuted as a singer at 13 years of age in 1999 under Epic Records Japan. Her third album Almost Seventeen (2002) saw a great leap in popularity for Crystal Kay, reaching number two on Oricon's albums chart. In 2005, Crystal Kay sang the eponymous theme song for the Tsuyoshi Kusanagi drama Koi ni Ochitara: Boku no Seikō no Himitsu. "Koi ni Ochitara" became Crystal Kay's most successful single, being certified for a million ringtone downloads.

In 2011, Crystal Kay signed to Delicious Deli Records, after 11 years with Epic Records, and released the album Vivid (2012).^[1] In March 2013 Crystal Kay relocated to New York City to pursue an American debut through Copetin Inc, releasing the single "Busy Doing Nothing" a year later. In October 2014, Crystal Kay re-focused on Japan by switching her management to LDH.^[2]

Studio albums

List of studio albums, with selected chart positions and certifications

Title	Album details	Peak positions			Sales[3][A]	Certifications
		JPN [4]	KOR Intl. [5][B][C]	TWN East Asia [7][D][E]
C.L.L Crystal Lover Light	Released: March 23, 2000 (JPN) Label: Epic Formats: CD, digital download, streaming	60	—	—	JPN: 19,000
637: Always and Forever	Released: August 22, 2001 (JPN) Label: Epic Formats: CD, digital download, streaming	19	—	—	JPN: 49,000	RIAJ: Gold[9]
Almost Seventeen	Released: October 23, 2002 (JPN) Label: Epic Formats: CD, digital download, streaming	2	—	—	JPN: 354,000	RIAJ: Gold[10]
4 Real	Released: November 27, 2003 (JPN) Label: Epic Formats: CD, digital download, streaming	6	—	—	JPN: 246,000	RIAJ: Platinum[10]
Crystal Style	Released: March 2, 2005 (JPN) Label: Epic Formats: CD, CD/DVD, digital download, streaming	2	—	—	JPN: 297,000	RIAJ: Platinum[11]
Call Me Miss...	Released: February 22, 2006 (JPN) Label: Epic Formats: CD, CD/DVD, digital download, streaming	2	—	—	JPN: 251,000	RIAJ: Platinum[12]
All Yours	Released: June 20, 2007 (JPN) Label: Epic Formats: CD, CD/DVD, digital download, streaming	1	—	5	JPN: 137,000	RIAJ: Gold[13]
Color Change!	Released: August 6, 2008 (JPN) Label: Epic Formats: CD, CD/2DVD, digital download, streaming	8	—	—	JPN: 100,000	RIAJ: Gold[14]
Spin the Music	Released: December 8, 2010 (JPN) Label: Epic Formats: CD, digital download, streaming	42	40	—	JPN: 10,000
Vivid	Released: June 27, 2012 Label: Delicious Deli Formats: CD, CD/DVD, digital download, streaming	35	—	—	JPN: 5,000
Shine	Released: December 16, 2015 Label: Delicious Deli Formats: CD, CD/DVD, CD/Blu-ray, digital download, streaming	10	—	—	JPN: 17,000
For You	Released: June 13, 2018 Label: Virgin Formats: CD, CD/DVD, digital download, streaming	30	—	—	JPN: 4,000
"—" denotes items which were released before the creation of the G-Music or Gaon charts, or items that did not chart.

Extended plays

List of extended plays, with selected chart positions

Title	Album details	Peak positions	Sales[3]
		JPN [4]
Shining	Released: November 28, 2007 (JPN) Label: Epic Formats: CD, digital download, streaming	21	JPN: 12,000
Flash	Released: June 16, 2010 (JPN) Label: Epic Formats: CD, CD/DVD, digital download, streaming	29	JPN: 6,000
Start Again EP	Released: February 24, 2023 Label: Virgin Formats: Digital download, streaming	—
"—" denotes items that did not chart.

Compilation albums

List of compilation albums, with selected chart positions and certifications

Title	Album details	Peak positions	Sales[3]	Certifications
		JPN [4]
Crystal Kay	Album compiling English language songs, released as Natural: World Premiere Album in Japan Released: November 7, 2003 (KOR) Label: Epic Formats: CD, digital download, streaming	34	JPN: 30,000
CK5	Released: June 30, 2004 (JPN) Label: Epic Formats: CD, CD/DVD, digital download, streaming	2	JPN: 282,000	RIAJ: Platinum[15]
Best of Crystal Kay	Released: September 2, 2009 (JPN) Label: Epic Formats: 2CD, 3CD, digital download, streaming	3	JPN: 156,000	RIAJ: Gold[16]
The Best Remixes of CK	Released: December 16, 2009 (JPN) Label: Epic Formats: CD, digital download, streaming	195	JPN: 1,000
Love Song Best	Released: December 14, 2011 (JPN) Label: Epic Formats: CD, 2CD, digital download, streaming	81	JPN: 4,000

Cover albums

List of cover albums, with selected chart positions

Title	Album details	Peak positions
		JPN [4]
I Sing	Released: April 21, 2021 Label: Virgin Formats: CD, digital download, streaming	61

Soundtrack albums

List of soundtrack albums, with selected chart positions

Title	Album details
A2Z[17] (with Akihiro Manabe)	Released: March 1, 2023 Label: Virgin Formats: CD, digital download, streaming

Singles

As a lead artist

List of singles, with selected chart positions

Title	Year	Peak chart positions			Sales (JPN)[3]	Certifications	Album
		JPN [4]	JPN Hot [18][F]	TWN East Asia [7][E]
"Eternal Memories"	1999	47	—	—	20,000		C.L.L Crystal Lover Light
"Teenage Universe (Chewing Gum Baby)"		47	—	—	13,000
"Komichi no Hana" (こみちの花, "Path Flower")		80	—	—	3,000
"Shadows of Desire"	2000	—	—	—
"Girl's Night"	2001	100	—	—	2,000		637: Always and Forever
"Ex-Boyfriend" (featuring Verbal)		44	—	—	21,000
"Think of U"		60	—	—	7,000		Almost Seventeen
"Hard to Say"	2002	26	—	—	45,000
"Girl U Love"		156	—	—	1,000
"Boyfriend (Part II)"	2003	3	40[G]	—	33,000	RIAJ (digital): Gold	4 Real
"I Like It" (with M-Flo)		8	—	—	58,000
"Candy"		2	—	—	15,000
"Can't Be Stopped"		146	—	—	1,000
"Motherland"	2004	9	—	—	43,000		CK5
"Bye My Darling!"		40	—	—	7,000		Crystal Style
"Kiss"	2005	10	—	—	65,000	RIAJ (cellphone): Gold[35]
"Koi ni Ochitara" (恋におちたら, "If I Fall in Love")		2	51[G]	—	295,000	RIAJ (ringtone): Million[36] RIAJ (digital): 2× Platinum[37] RIAJ (physical): Platinum[38] RIAJ (streaming): Gold[39]	Call Me Miss...
"Two as One" (with Chemistry)		2	—	—	107,000	RIAJ (cellphone): Gold[40] RIAJ (physical): Gold[41]
"Kirakuni" ("Take It Easy")	2006	27	1	5	14,000
"Together"			12
"Kitto Eien ni" (きっと永遠に, "Surely for Eternity")	2007	12	—	—	20,000	RIAJ (cellphone): Gold[42]	All Yours
"Konna ni Chikaku de..." (こんなに近くで, "This Close...")		14	—	—	17,000	RIAJ (cellphone): Gold[43]
"Anata no Soba de" (あなたのそばで, "Next to You")		30	—	—	7,000
"Namida no Saki ni" (涙のさきに, "Beyond the Tears")	2008	42	29	—	4,000		Color Change!
"One"		32	20	—	7,000
"Girlfriend" (featuring BoA)	2009	31	57	—	4,000		Best of Crystal Kay
"After Love (First Boyfriend)" (featuring Kaname of Chemistry)			20				Spin the Music
"Journey (Kimi to Futari de)" (君と二人で, "Together with You")	2010	193	14	—	400
"Superman"	2011	55	7	—	3,000		Vivid
"Delicious na Kinyōbi" (デリシャスな金曜日, "Delicious Friday")	2012	171	9	—	400
"Haruarashi" (ハルアラシ, "Spring Storm")			—[H]
"Forever"		—	6	—
"Busy Doing Nothing"[45]	2014	—	—	—			non-album singles
"Rule Your World"[46]		—	—	—
"Dum Ditty Dumb"[47]		—	—	—
"Kimi ga Ita kara" (君がいたから, "Because You Were There")	2015	27	21	—	6,000	RIAJ (digital): Gold[48]	Shine
"Revolution" (featuring Namie Amuro)		6	8	4	19,000
"Nando de Mo" (何度でも, "Many Times")[49]		—	16	—		RIAJ (digital): Gold[48]
"Sakura" (サクラ, "Cherry Blossoms")	2016	30	—[I]	—			For You
"Lovin' You"		149	—	—
"Faces"	2017	—	—	—
"Shiawase tte." (幸せって。, "You are happy.")	2018	—	80	—
"Beautiful"	2019	—	—	—			non-album single
"Sangatsu Kokonoka" (３月９日, "March 9th")	2020	—	—	—			I Sing
"Utautai no Ballad" (歌うたいのバラッド, "Ballad I want to sing")		—	—	—
"I Love..."		—	—	—
"Hitori Ja Naikara" (ひとりじゃないから, "Because I'm not alone")	2021	—	—	—			Non-album singles
"Say My Name" (with Tetsu)		—	—	—
"Just for One Night"[51] (with Bsmntprty and Niko Brim)		—	—	—
"Gimme Some"[52] (with Daichi Yamamoto)	2022	—	—	—
"No Pressure"[53] (featuring VivaOla)		—	—	—
"Love Me"[54]		—	—	—
"Start Again"	2023	—	—	—			Start Again EP & A2Z
"How You Feel"		—	—	—
"Spark"		—	—	—
"That Girl"	2024	—	—	—			TBA
"—" denotes items which were released before the creation of the Billboard Japan Hot 100, or did not chart.

As a featured artist

List of singles, with selected chart positions

Title	Year	Peak chart positions		Sales (JPN)[3]	Album
		JPN [4]	JPN Hot [18][F]
"Lost Child" (Hiroshi Fujiwara and Shinichi Osawa featuring Crystal Kay)	2001	55	—	15,000	Satorare Original Soundtrack / 637: Always and Forever
"Reeewind!" (M-Flo loves Crystal Kay)	2003	9	—	50,000	Astromantic
"Universe"[J] (BoA featuring Crystal Kay and Verbal of M-Flo)	2009	8	—	22,000	Best & USA
"Lovin' You" (ラヴィン・ユー, Ravin Yū) (Shota Shimizu, Crystal Kay, Mummy-D, Seamo, Dohzi-T)	2010	—	—		Beat Connection
"All You Need Is Love" (among Japan United with Music)	2012	11	11	26,000	Non-album single
"Answer" (with Tee)		77	16	1,000	Much Love
"Where the Wild Things Are" (Far East Movement featuring Crystal Kay and Stereotypes)		—	—[K]		Dirty Bass
"Physical" (Bradberry Orchestra featuring Suga Shikao, Crystal Kay and Salyu)		—	72		Non-album single
"Fantastic Journey" (Daishi Dance featuring Crystal Kay)		—	—[L]		Wonder Tourism
"Inochi no Rhythm" (イノチノリズム, "Rhythm of Life") (among Dance Earth Party)	2013	5	5	20,000	Non-album single
"Rock City" (Exile Shokichi featuring Sway & Crystal Kay)	2016	—	—		The Future
"Play That" (PKCZ featuring Hiroomi Tosaka, Crystal Kay & CRAZYBOY)	2017	—	—		360° ChamberZ
"Hot Like You (Fire)" (Freddy Browne featuring Jimmy Cozier & Crystal Kay)	2018	—	—		The Recipe
"Anata no Shiranai Watashitachi" (あなたの知らない私たち, "The Us You Don't Know") (chay featuring Crystal Kay)		61	—		Lavender
"—" denotes items which were released before the creation of the Billboard Japan Hot 100 or did not chart.

Promotional singles

List of promotional singles, with selected chart positions

Title	Year	Peak chart positions	Album
		JPN Hot [18][F]
"Shining"	2007	—	Shining
"Step by Step"	2009	52	Best of Crystal Kay
"Flash"	2010	40	Flash
"Time of Love"		—	Spin the Music
"Take It Outside"	2012	—	Vivid
"Memory Box"		—
"What We Do"		—
"My Heart Beat"[58]	2013	—	Non-album songs
"Kaze no Kanata" (風の彼方, "The Other Side of the Wind")[58]		—
"Very Special" (featuring Ryuji Imaichi (Sandaime J Soul Brothers from Exile Tribe)	2015	60	Shine
"Rain on Me"[59] (with Sumire, Tigarah & Ukico)	2020	—	Non-album song
"Steady"	2021	—	Speed Spirits
"—" denotes items that were released before the creation of the Japan Hot 100, or did not chart.

Other appearances

Title	Year	Album	Notes
"L'amant" (Ken Hirai)	2001	Gaining Through Losing	Cameo introduction vocals
"Feel the Same?" (DJ Watarai featuring Big-O & Crystal Kay)	2002	Harlem Ver. 1.0
"Tha Superstar" (Michico)		Non-album song	Cameo vocals
"Hello Goodbye" (Palm Drive featuring Crystal Kay & Corn Head)	2003	Block Holiday
"Do U Like It? (by Fantastic Plastic Machine)" (Crystal Kay loves M-Flo)		"Reeewind!" (single)	Remix of "I Like It"
"Get On!" (M-Flo loves Crystal Kay)		Astromantic	Originally appeared on the "Reeewind!" single
"Reeewind! (Tomita Lab. Remix)" (M-Flo loves Crystal Kay)	2004	Astromantic Charm School
"Get On! (Ugly Duckling Remix)" (M-Flo loves Crystal Kay)
"Love Don't Cry" (M-Flo loves Crystal Kay)	2007	Cosmicolor
"Love Don't Cry (KGN8 Remix)" (M-Flo loves Crystal Kay)		Electricolor	Remixed by Stephen McGregor.
"Music Is Mine" (Maboroshi featuring Crystal Kay)	2009	Maboroshi no Shi
"Wonder" (Jin Akanishi featuring Crystal Kay)		KAT-TUN Live: Break the Records (video album)	Duet with Jin Akanishi, performed live at KAT-TUN's Summer '09 Break the Records (2009) tour and Akanishi's solo Yellow Gold 3011 (2011), however the studio recording has not been released.
"Universe (BoA Release Party 2009 Best & USA: Thank You For Your Support!! @ Studio Coast)" (BoA featuring Crystal Kay & Verbal (M-Flo))	2010	Identity (CD/DVD)
"Zutto" (ずっと, "On and On") (Tokyo Ska Paradise Orchestra (Vocal: Crystal Kay))		World Ska Symphony
"Love Don't Cry (live)" (M-Flo loves Crystal Kay)		M-Flo 10 Years Special Live: We Are One (video album)
"Reeewind! / Get On! (live)" (M-Flo loves Crystal Kay)
"Cannonball"		10-nen Saki mo Kimi ni Koishite Original Soundtrack	Acted as the ending theme song for the drama, while Crystal Kay's song "Time of Love" was the theme song.
"Zutto (live)" (Tokyo Ska Paradise Orchestra with Crystal Kay)		Tokyo Ska Paradise Kokugikan & Tokyo Ska Paradise Taiikukan Live DVD (video album)
"Jungle Boogie (live)" (ジャングル・ブギ, Janguru Bugi) (Tokyo Ska Paradise Orchestra with Tamio Okuda, Crystal Kay, Kazuyoshi Saito)
"Get On! (The Suitboys Remix)" (M-Flo loves Crystal Kay)	2011	After 5 Vol. 1	Remixed by Taku Takahashi.
"Koi ni Ochitara (live)"		Jyonetsu Tairiku Live Best
"Suki (live)" (Dreams Come True with Crystal Kay)	2012	Minna de Dori Suru? Do You Dreams Come True? Special Live! (video album)
"Asa ga Mata Kuru (live)" (朝がまた来る, "The Morning Still Comes") (Dreams Come True with Crystal Kay)
"Endless Love" (Lionel Richie with Crystal Kay)		Tuskegee (Japanese Edition)	Japanese bonus track, replacing Shania Twain's vocals with Crystal Kay's.
"Eyes on Me (live)"		Final Fantasy Orchestral Album (video album)
"Senka no Hoshi de" (戦下の地球(ほし)で, "On the Planet Under War") (among Dance Earth Party)	2013	"Inochi no Rhythm" (single)
"Boyfriend (Part II) (live)"		Live & Documentary DVD "AP Bank Fes '12 Fund for Japan" (video album)	DVD charity concert for AP Bank.
"I Don't Care" (Aklo featuring Crystal Kay)	2014	The Arrival
"All My Ladies" (Che'Nelle featuring Crystal Kay & Thelma Aoyama)	2015	@chenelleworld
"Nekketsu" (Nekfeu featuring Crystal Kay)	2016	Cyborg
"Inochi no Rhythm ~Great Journey~" (イノチノリズム ~Great Journey~, "Rhythm of Life ~Great Journey~") (DANCE EARTH PARTY featuring EXILE NESMITH with Crystal Kay)	2017	I	Cd and DVD
"Without You" (JAY'ED featuring Crystal Kay)		Here I Stand
"World Is Yours" (PKCZ featuring Crystal Kay, MIGHTY CROWN (MASTA SIMON & SAMI-T))		360°ChamberZ
"T-REX" (PKCZ featuring Crystal Kay, CRAZYBOY, ANARCHY )
"Ai wa Naze" (愛はなぜ, "Why is love") (Sung Si-kyung with Crystal Kay)	2018	Kimi ga Iru yo
"TAYUTAU" (LNoL featuring Crystal Kay)	2019	Equanimity
"Pixels" (Nekfeu featuring Crystal Kay)	2019	Les étoiles vagabondes : expansion
"Your Hands", "Tetris Crystal", "I Think the Game", "On Top", "I Love Vertigo" (Chassol featuring Crystal Kay)	2020	Ludi	Appearing also in the video version of the album.

Video albums

List of media, with selected chart positions

Title	Album details	Peak positions
		JPN [4]
CK 99—04 Music Clips	Released: June 30, 2004 (JPN) Label: Epic Formats: DVD, UMD	19
CK 04—09 Music Clips 2: Decade	Released: December 2, 2009 (JPN) Label: Epic Formats: DVD	253
Crystal Kay Live in NHK Hall: 10th Anniversary Tour CK10	Released: June 16, 2010 (JPN) Label: Epic Formats: DVD, Blu-ray	122
CK Live 2012: Vivid	Released: March 6, 2013 (JPN) Label: Universal Formats: DVD	—
"—" denotes items that did not chart.

Notes

1. Sales provided by Oricon database and are rounded to the nearest thousand copies, or for when the value rounds to zero, the nearest hundred copies.
2. The Gaon Albums Chart was established in 2010. The overseas chart is a sub-chart listing all non-Korean released which have charted.
3. Week references for Gaon: Rock 'n' Roll Circus,^[6]
4. The G-Music chart was established in July 2005 and only archives the top 20 releases. The East Asian chart is a sub-chart that compiles all non-Chinese Asian language releases which have been popular on the charts.
5. Week references for G-Music: All Yours 2007 week 25, "Revolution".^[8]
6. Sources for chart positions are as follows: "Namida no Saki ni",^[19] "One",^[20] "After Love (First Boyfriend)",^[21] "Girlfriend",^[21] "Boyfriend (Part II)",^[22] "Koi ni Ochitara",^[22] "Step by Step",^[22] "Flash",^[23] "Journey (Kimi to Futari de)",^[24] "Superman",^[25] "All You Need Is Love",^[26] "Delicious na Kinyōbi",^[27] "Forever",^[28] "Answer",^[29] "Physical",^[30] "Inochi no Rhythm",^[31] "Kimi ga Ita kara",^[32] "Revolution",^[33] "Nando demo",^[34] "Very Special".^[34]
7. Charted in 2009.
8. Charted at number 90 on the Adult Contemporary Airplay chart.^[44]
9. Charted at number 96 on the Radio Songs sub-chart.^[50]
10. As one of the three A-sides of the single "Eien / Universe / Believe in Love".
11. Charted at number 47 on the Adult Contemporary Airplay and at 99 on the Hot Top Airplay charts.^[55][56]
12. Charted at number 78 on the Adult Contemporary Airplay chart.^[57]

References

1. "Crystal Kayユニバーサル移籍、待望シングル12月に登場" (in Japanese). Natalie. October 16, 2011. Retrieved September 13, 2014.
2. "Crystal Kay | MUSICIAN | ARTIST | LDH" (in Japanese). LDH. Retrieved November 18, 2015.
3. "オリコンランキング情報サービス「you大樹」" [Oricon Ranking Information Service 'You Big Tree']. Oricon (in Japanese). Retrieved September 12, 2014.
4. "Crystal Kayのリリース一覧" [List of Crystal Kay's Releases]. Oricon (in Japanese). Retrieved September 12, 2014.
5. "Gaon Album Chart 국외". Gaon Music Chart (in Korean). Korea Music Content Industry Association. Archived from the original on July 14, 2014. Retrieved July 18, 2014.
6. "2010년 52주차 Album Chart 국외". Gaon Music Chart (in Korean). Korea Music Content Industry Association. Archived from the original on September 13, 2014. Retrieved September 12, 2014.
7. "G-Music J-Pop Chart" (in Chinese). G-Music. Archived from the original on May 12, 2011. Retrieved September 12, 2014.
8. g-music 風雲榜. G-Music. September 25, 2015. Archived from the original on October 30, 2015. Retrieved October 23, 2015.
9. ゴールド等認定作品一覧 2003年10月 [Works Receiving Certifications List (Gold, etc) (October 2003)] (in Japanese). Recording Industry Association of Japan. November 10, 2003. Retrieved March 29, 2014.
10. ゴールド等認定作品一覧 2003年12月 [Works Receiving Certifications List (Gold, etc) (December 2003)] (in Japanese). Recording Industry Association of Japan. January 10, 2004. Retrieved February 15, 2014.
11. ゴールド等認定作品一覧 2005年4月 [Works Receiving Certifications List (Gold, etc) (April 2005)] (in Japanese). Recording Industry Association of Japan. May 10, 2005. Retrieved March 18, 2014.
12. ゴールド等認定作品一覧 2006年2月 [Works Receiving Certifications List (Gold, etc) (February 2006)] (in Japanese). Recording Industry Association of Japan. March 10, 2006. Retrieved January 22, 2014.
13. ゴールド等認定作品一覧 2007年6月 [Works Receiving Certifications List (Gold, etc) (June 2007)] (in Japanese). Recording Industry Association of Japan. July 10, 2007. Retrieved February 13, 2014.
14. ゴールド等認定作品一覧 2008年8月 [Works Receiving Certifications List (Gold, etc) (August 2008)] (in Japanese). Recording Industry Association of Japan. September 10, 2008. Retrieved March 29, 2014.
15. ゴールド等認定作品一覧 2004年7月 [Works Receiving Certifications List (Gold, etc) (July 2004)] (in Japanese). Recording Industry Association of Japan. August 10, 2004. Retrieved February 15, 2014.
16. ゴールド等認定作品一覧 2009年9月 [Works Receiving Certifications List (Gold, etc) (September 2009)] (in Japanese). Recording Industry Association of Japan. October 10, 2009. Retrieved March 29, 2014.
17. "A2Z (CD) - Crystal Kay". Universal Music Japan (in Japanese). Retrieved 2023-03-02.
18. The Japan Hot 100 was established in February 2008.
    • "Hot 100｜JAPAN Charts｜Billboard JAPAN" (in Japanese). Billboard.
19. "Japan Billboard Hot 100". Billboard (in Japanese). June 18, 2008. Retrieved September 12, 2014.
20. "Japan Billboard Hot 100". Billboard (in Japanese). July 23, 2008. Retrieved September 12, 2014.
21. "Japan Billboard Hot 100". Billboard (in Japanese). August 19, 2009. Retrieved September 12, 2014.
22. "Japan Billboard Hot 100". Billboard (in Japanese). September 9, 2009. Retrieved September 12, 2014.
23. "Japan Billboard Hot 100". Billboard (in Japanese). June 23, 2010. Retrieved September 12, 2014.
24. "Japan Billboard Hot 100". Billboard (in Japanese). December 1, 2010. Retrieved September 12, 2014.
25. "Japan Billboard Hot 100". Billboard (in Japanese). November 9, 2011. Retrieved September 12, 2014.
26. "Japan Billboard Hot 100". Billboard (in Japanese). February 1, 2012. Retrieved September 12, 2014.
27. "Japan Billboard Hot 100". Billboard (in Japanese). March 14, 2009. Retrieved September 12, 2014.
28. "Japan Billboard Hot 100". Billboard (in Japanese). June 13, 2012. Retrieved September 12, 2014.
29. "Japan Billboard Hot 100". Billboard (in Japanese). April 18, 2012. Retrieved September 12, 2014.
30. "Japan Billboard Hot 100". Billboard (in Japanese). August 6, 2012. Retrieved September 12, 2014.
31. "Japan Billboard Hot 100". Billboard (in Japanese). January 23, 2013. Retrieved September 12, 2014.
32. "Japan Billboard Hot 100". Billboard (in Japanese). June 10, 2015. Retrieved June 10, 2015.
33. "Japan Billboard Hot 100". Billboard (in Japanese). September 23, 2015. Retrieved September 23, 2015.
34. "Japan Billboard Hot 100". Billboard (in Japanese). December 23, 2015. Retrieved December 24, 2015.
35. レコード協会調べ 12月度有料音楽配信認定 [Record Association Investigation: December Digital Music Download Certifications] (in Japanese). Recording Industry Association of Japan. January 20, 2012. Retrieved January 26, 2014.
36. レコード協会調べ 8月度有料音楽配信認定 [Record Association Investigation: August Digital Music Download Certifications] (in Japanese). Recording Industry Association of Japan. September 20, 2006. Retrieved January 23, 2014.
37. レコード協会調べ 1月度有料音楽配信認定 [Record Association Investigation: January Digital Music Download Certifications] (in Japanese). Recording Industry Association of Japan. February 28, 2014. Retrieved March 4, 2014.
38. ゴールド等認定作品一覧 2005年6月 [Works Receiving Certifications List (Gold, etc) (June 2005)] (in Japanese). Recording Industry Association of Japan. July 10, 2005. Retrieved January 1, 2014.
39. "Japanese single streaming certifications – Crystal Kay – 恋におちたら" (in Japanese). Recording Industry Association of Japan. Retrieved July 25, 2024. Select 2024年6月 on the drop-down menu
40. レコード協会調べ 10月度有料音楽配信認定 [Record Association Investigation: October Digital Music Download Certifications] (in Japanese). Recording Industry Association of Japan. November 20, 2006. Retrieved January 23, 2014.
41. ゴールド等認定作品一覧 2005年9月 [Works Receiving Certifications List (Gold, etc) (September 2005)] (in Japanese). Recording Industry Association of Japan. October 10, 2005. Retrieved January 22, 2014.
42. レコード協会調べ 7月度有料音楽配信認定 [Record Association Investigation: July Digital Music Download Certifications] (in Japanese). Recording Industry Association of Japan. August 20, 2007. Retrieved December 23, 2013.
43. レコード協会調べ 4月度有料音楽配信認定 [Record Association Investigation: April Digital Music Download Certifications] (in Japanese). Recording Industry Association of Japan. May 20, 2010. Retrieved January 22, 2014.
44. "Japan Billboard Adult Contemporary Airplay". Billboard (in Japanese). March 21, 2012. Retrieved September 12, 2014.
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