This song began as a late-night party jam with Paul Simon, Art Gafunkel and various and friends . Simon’s younger brother, Eddie, began banging on a piano bench during the party. A friend grabbed a guitar, strumming and punctuating the rhythm with “aahs. They recorded it an a portable tape recorded for fun .
In the studio Simon took a little more than a minute of this impromptu groove and looped it for the beat of the song adding a guitar line next and then all the other instruments and vocals
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