Jesus Christ Superstar. Topping out at #28, Elliman's song "I Don't Know How To Love Him" was a modest pop hit but almost a footnote in light of this trifecta: Elliman sang on the 1971 original JCS album and then went on to play the role of Mary Magdalene on Broadway and in the subsequent film version (earning a 1974 Golden Globe Best Actress nomination).
Saturday Night Fever. By 1978, the young woman who started the decade singing in London clubs sat atop the world of showbiz, having been on the radio, the stage, screen, and even on tour with Eric Clapton. She actually did a five year stint singing for Eric, which includes work on both 461 Ocean Boulevard and Slow Hand.