Simon's record sales declined considerably with 1975's Playing Possum and 1976's Another Passenger. Playing Possum was a Top Ten album, and garnered a successful Top 40 single "Attitude Dancing" and two other charting singles, but its racy album cover, which depicts Simon wearing only a black negligee and knee-high black boots, generated controversy. In 1991, Rolling Stone ranked it No. 20 on their list of the 100 greatest album covers. Another Passenger produced only one charting single on the Pop singles chart, "It Keeps You Runnin'", with the Doobie Brothers, which peaked just outside the Top 40, at No. 46, and the second single, "Half A Chance", only charted on the Adult Contemporary chart. Despite the lukewarm commercial reception, the album was, and remains, one of Simon's best reviewed works, with Rolling Stone calling it "Carly Simon's best record". The album became a favorite among many of Simon's fans. 1976 also saw Simon contributing backup vocals on the song "Peter" on Peter Ivers's album Peter Ivers. She also made her only appearance on Saturday Night Live. It was a pre-taped performance—a rare occurrence on that show—because Simon suffered terrible bouts of stage fright. In the appearance, she sang two songs: "Half A Chance" and her signature song, "You're So Vain".