Despite that feeling, the album expanded the group's sonic palette. Instruments like keyboards and saxophones, played by John Fogerty, were incorporated, and Cook contributed on piano. Harmonica, vibraphone, recorder, and percussion are also heard. An interesting detail is the use of the Hammond B-3 organ by John Fogerty on several tracks, inspired by Booker T. & the M.G.'s, a group he deeply admired. In fact, when Duck Dunn and Steve Cropper from the M.G.'s heard the record, they commented that the sound was very similar to that of their bandmate Booker T. Jones.
From this work, two songs emerged that reached the top spots: "Have You Ever Seen the Rain" and "Hey Tonight". The former, written by John Fogerty, spoke about the band's impending separation. The album closed with "Rude Awakening #2", an foray into the psychedelic that some members considered "embarrassing" or "pointless". Pendulum was the last album recorded with Tom Fogerty as an active member, who left the band in early 1971 to start his solo career. The album, released in December 1970, was a commercial success, reaching the top 10 in ten countries and peaking at number 5 on the Billboard 200. The single "Have You Ever Seen the Rain" / "Hey Tonight", released in January 1971, charted at number eight on the Billboard Hot 100.