• Suppose we want to play the D-G-C ii V I chord progression.
• For G, we can use notes from the altered scale.
• This can be thought of as playing Ab melodic minor scale, starting from G.
• Recall that melodic minor = major scale with flattened 3rd.
• Alternatively, think in terms of "right hand chords available". The left hand plays the shell, given by B-F (3rd and 7th). Right hand can play:
• C#/D♭ major (D♭–F–A♭): gives ♭5, ♭7, ♭9
• E♭ major (E♭–G–B♭): gives ♭13, root, ♯9
• A♭ minor (A♭–C♭–E♭): gives ♭9, 3, ♭13
• B♭ minor (B♭–D♭–F): gives ♯9, ♭5, ♭7

§ Higher Alterations (when is 9th, 11th, 13th available)

• We stop at 13th, since we get 1-3-5-7-9-11-13 which is 7 notes, so we've run past everything by the time we get to 13th.
• We need to know when the 9th, 11th, and 13th are available.
• 9th is always available.
• 11th only over minor, clashes over major.
• Also consider playing with the 5 (#5, b5)