scales

The D Mixolydian mode (D E F# GA B C) contains the notes of a D9 chord (D F# AC E) so use this scale to solo with wherever you see a D9 in the chart. Simply move the whole shape and start on a G note to play G Mixolydian over the G9 chords. Use D Ab blues scale (DF G A C) for a tenser, bluesier sound.