Watch the Mellow Extensions online guitar lesson by Frank Vignola from Essentials: Jazz Standard Soloing
This one is in the key Ab, starting on Bb7 to an Eb7. Look at that, another 2-5-1 gets us started! The tune is in halves, or two similar 16 measure progressions. Notice the minor chord becomes a diminished at the end. We use extended arpeggios here, meaning the extensions of chords in arpeggiated form. We start on the 3rd of Bb7 or D, then move up to the 5th, 7th, then 9th, and then we move to the Eb7 chord upper extensions starting on the Db or flat 7, moving up the chord using the b9, then the 13th. These are the upper extensions and the concept behind this solo.