There are dozens of jazz heads based on the chord changes to Gershwin’s “I Got Rhythm”, which makes it probably the most popular standard template after the 12-bar blues.  Unlike the blues, though, almost every version of “rhythm changes” is in the same key.  Usually the difference in these tunes lies in the B section, as can be seen in this Cannonball Adderley composition, where he replaces the usual D7 / G7 / C7 / F7 with a Bb7 / Ab7 / Gb7 / F7 progression (with attendant subdominants).



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