The Rock 12bar blues is generally alot simpler than the jazz one. Here's the stock standard form I---|IV(I)---|I---|I--- IV---|IV---|I---|I--- V---|IV---|I---|IV #IV V <- phrasing = 1 a 2 a 3 a 4 a There's plenty of variants of it, buts thats the one that i come across most often. The turnaround in the last bar can be what ever you like really, aslong as it resolves strongly back into the the 'I' chord.
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