How do you decide which scales to play over the V chord in a minor ii-V? I have used the diminished h/w over V7(b9) or #9 chords and the alt scale (aka diminished whole tone) over chords with anything with a #5 over it (i.e. #9 #5 or alt chords), but as i'm understanding the fluid nature of harmony better i realize that almost any alterations or combinations thereof can be applied to the V chord in this context. It seems that alterations can be more or less at the discretion of the harmonic instrument. So much of the time alterations aren't included on a typical lead sheet. One pianist i worked with suggested that i just use the alt scale all the time as it avoids the cliches of the symetrical diminished scale. I'm leaning in this direction. What's the current thinking on this for a modern jazz context?