According to Stu Cook (CCR bassist/keyboardist), this song was written and rehearsed from scratch during one recording session. This song is John Fogerty's take on the imminent departure of his brother Tom from the band, and the overall tension in the group at a time when they should have been enjoying their success. The line, "I want to know - have you ever seen the rain comin' down on a sunny day?" refers to Tom leaving while CCR was at its commercial zenith. The flip side of this single, "Hey Tonight," is John reassuring the band that all would go well despite the adversity. In an interview, Fogerty stated that the song was written about the fact that they were on the top of the charts, and had surpassed all of their wildest expectations of fame and fortune. They were rich and famous, but somehow all of the members of the band at the time were depressed and unhappy. Thus the line "Have you ever seen the rain, coming down on a sunny day."
Musically, this song was inspired by the group Booker T. & the MG's, whose most famous song is "Green Onions". They opened for Creedence Clearwater Revival before CCR recorded the Pendulum album. John Fogerty loved the sound of Booker T. Jones' Hammond organ, so he used it on some tracks for the album, including this one.
Tom Fogerty left the group in early 1971, after this album was released. He released three solo albums before dying of tuberculosis in 1990.
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