"Papa was a Rollin' Stone" by the Temptations is a one chord song, although there's plenty of vocal and instrumental embellishment, there is actually only one chord in the structure. "Commotion" by Creedence fits this, too. Both of them are built on a single minor chord. "Born on the Bayou" is built on a seventh chord, although there is a quick two chord turnaround, all the melody is built around the single seventh
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