I dabble in trumpet playing a little and ran across this video while surfing over in TrumpetHerald. You don't have to play trumpet to get something from this. There are 3 tonal (key) centers and you use just 4 notes in each. Good insights for any soloist. http://www.youtube.com/watch?v=xr3RYOEC-yk
Of course this isn't the only way to skin the cat, but it is one (relatively) easy way.
Cheers
Dave
Very clever! It's far from a comprehensive answer to improv but it's a great way to quickly orient yourself to a new piece. Another arrow in my quiver.
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Warwick Club member #231, finally got my C.S. Bass VI . . .