Eric Clapton's career as a pop hitmaker peaked in 1977 with the release of his fifth album, Slowhand. It produced the hit singles "Lay Down Sally," "Wonderful Tonight" and "Cocaine." It probably could have become a Number One album, but it was up against the Saturday Night Fever soundtrack's 24-week reign at the top of the charts. One song off the album that didn't get much attention was "The Core," a nearly nine-minute duet with backup singer Marcy Levy, who also co-wrote the tune. The song has slowly developed a following over the years, and today it's seen as one of Clapton's finest love songs.