Lawrie,
I can relate. A guy I used to play with was blind. He was also a multi instrumentalist.
I'd just just began experimenting with jazz diatonic progressions. He played primarily bluegrass. So did I.
I told him to just play lead over the chords I was going to play on his mandolin. I didn't know what I was going to play, and neither did he!
I launched into a heavily syncopated diatonic progression with 2-3 chord changes per bar.
We played for about 5 mins and he "tore it up" and everything sounded perfect!
After we finished, he said "That was cool! What key was it in?"!!!!!!!!!!!!!
If he hadn't been blind, ................ I'd have kicked his ass!!!!! ........ LOL.
He just knew what sounded right! And he played it off the cuff.
