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12 Essential Tunes
In the last bit of the "A" section, we have a bit of dominant madness to work through.
Our first chord is A7. This would use the D scale most simply, or possibly Bb melodic minor....
A7 turns into Am7 through the magic of jazz, and we can use our handy Gmaj scale here.
Am7 to D7 is a handy ii-V7 change, so use the key of G here. Our next chord is Db7- I would suggest repeating whatever it was you played for the D7 chord a second ago a half-step lower-this is a very slick jazz guitar trick. (be glad you don't play saxophone)