Re: any written material on Hassell`s harmonic structures/improvisation-approach

["Tilmann Dehnhard" <tilmann@dehnhard.com>]

i heard (and observed) hassell playing some keyboard in a concert last 
summer.
he played the same fiths he would use in his improvisations on trumpet - 
playing one note with left, one with the right hand. sweet stage presence 
he 
had, the old man.
he obviously has checked out the possibilities of parallel fifths 
thoroughly, not only on trumpet.
to me he is the only guy who sounds really good going parallel that way. 
he 
manages to leave out the undesired effect of random harminization, so i 
guess he knows exactly which intervals are the tacky or ugly one's and 
avoids them.

what i can hear is that he uses pretty clear/simple harmonic material like 
pentatonics, but superimposing a different harmonic center.
just an example: play Bb minor pentatonic over a C minor chord.
or B minor pentatonic over a C major chord.
(on F# the upper fifth will give you a b9...this would probably be one of 
the avoid notes for hassell)

tilmann

ps: he seemed kind of gloomy that night. i wondered if he was sick or had 
just recently recovered from some illness. anybody know how he is?