Following "Switched-On Bach II", Carlos changed musical directions once more. In 1971, she and Elkind had asked Columbia Records to attach a pre-paid business reply card in each new pressing of her albums, which resulted in a considerable amount of suggestions from the public regarding the subject of her future releases. The ideas received were divided; some asked for more classical adaptations, while others wanted more of Carlos' original compositions. Carlos decided, "If I was going to spend months for mere minutes of music, I certainly wasn't going to be pigeonholed into only retreading existing music", and so began a process of "re-directing new ideas, reworking old ones". By mid-1974, Carlos and Elkind had selected tracks of varying styles to record on the Moog synthesizer, which Carlos found liberating, as it demonstrated the flexibility of the instrument. Released as "By Request" in 1975, the album includes pieces from Bach, Wagner, Tchaikovsky, two of Carlos' compositions from the 1960s, and renditions of "Eleanor Rigby" by The Beatles and "What's New Pussycat?", originally sung by Tom Jones. The final track, a "witty and serious" set of variations based on themes by Edward Elgar, was replaced with tracks from "The Well-Tempered Synthesizer" on UK pressings after members of Elgar's estate refused to have his music presented in this style, which "devastated" Carlos. Between 1974 and 1980 she scored several short films for producer Dick Young for UNICEF (seven of which were released in 2005 on "Rediscovering Lost Scores, Vol.1").