Progression
The 12-bar blues (quick change) in Db major
12-bar blues (quick change) in Db major plays Db7, Gb7 and Ab7 — I, IV and V — across 12 chords. The same twelve-bar blues form, ending back on the I chord for the last two bars instead of turning around on V — common when a band is vamping into a repeat.
The chords, in order
Bar 1Db7I
Bar 2Gb7IV
Bar 3Db7I
Bar 4Db7I
Bar 5Gb7IV
Bar 6Gb7IV
Bar 7Db7I
Bar 8Db7I
Bar 9Ab7V
Bar 10Gb7IV
Bar 11Db7I
Bar 12Db7I