I saw him open for Rush once. He was amazing. R.I.P.
KEEP ON TRUCKIN'.....
In improvising within a modal context, a musician would basically start by thinking about playing the notes within that specific mode (e.g., D Dorian: D, E, F, G, A, B, C, D). - wikipedia "modal jazz" article
"In its most conventional sense, tonality refers to just the major and minor scale types - scales whose elements are capable of maintaining a consistent set of functional relationships." - A. Milne