Suggestions for structured progressive lessons for intermediate to advanced would be appreciated, just wading through material at the moment.
..are you looking for something for yourself or something to do with students? ..actually even within the student category alone two people who may consider themselves to be that level could be worlds apart when it comes to the theoretical foundation required to start explaining something about improv in a way more complex than just "let make some noise"Sometimes one with a classical background at a relatively advanced level will say they know their scales.. but actually all they know is how to play ionian mode similar motion in 12 keys.. which isnt even close to the beginning of knowing scales/keys in a way relevant to quality improv.
BTW I discovered what appears to be an excellent jazz improv play along series: Jamey Aebersold Jazz series,