The Lost Tapes is a two-disc compilation album by the San Franciscopsychedelic rock band Big Brother and the Holding Company with Janis Joplin as lead singer. The material on the first disc consists of a show at The Matrix on January 31, 1967 that is previously unreleased. The second disc consists primarily of a show at The California Hall on July 28, 1966 that had first seen release in 1984 as Cheaper Thrills, with the final track "Hall Of The Mountain King" taken from a KQED TV broadcast on April 25, 1967.[1][2]