Terrell had been ill, suffering from complications caused by a brain tumor, since the fall of 1967. Marvin Gaye later claimed that as a result, most of the female vocals on this album were performed by Valerie Simpson, who served as co-songwriter and co-producer for the LP with her boyfriend and future husband Nickolas Ashford.[1]
Simpson is quoted in Ludie Montgomery's biography of Terrell, My Sister Tommie, as not having subbed Terrell for vocals. Simpson again explicitly denied having done so in the liner notes to The Complete Motown Singles series.[2] On the docuseries Unsung about Terrell, Simpson admitted she sang with Gaye during sessions saying, "I sang things with Marvin because Tammi was not available. And, then we would bring Tammi in to go over her parts. Those are Tammi Terrell vocals because we know that we went back in with Tammi and got what we needed."
Gaye at the time criticized Motown for the album thinking they were taking advantage of Terrell's health. Motown assured him proceeds from the album would go to Terrell's family for insurance of her health. At the time the album was released, Terrell was on her seventh operation to cure the brain tumor that would eventually kill her after the eighth operation. The album was released on compact disc in 1992, and again in 2001 as part of The Complete Duets.
Ritz, David. Divided Soul: the Life of Marvin Gaye (originally published in 1985; 2003 edition ISBN0-306-81191-X) (For this book, Gaye told Ritz that Simpson subbed for Terrell on Easy.)
Montgomery, Ludie. My Sister Tommie: the Real Tammi Terrell (2005, ISBN1-904408-16-8) (In this book, Simpson denies subbing for Terrell.)
Hughes, Keith & Dahl, Bill. The Complete Motown Singles, Vol. 9: 1969 (2008) (Simpson again denies subbing for Terrell, except for some early guide vocals; she suggests this is what Marvin later remembered when speaking to Ritz.)
