Coltrane was moving out of jazz into something else. And certainly Miles Davis was doing the same thing.

If you feel you have the right key, you try to make some phrase or sound that will fit.

There's a certain phraseology involved in jazz, and I've moved away from that.

Jazz, for me, is a closed circuit, like the term baroque in the world of classical music.

I feel very strongly when there's no chance for me to find a key to a piece.

Other times I say: I would very much like to try to do something with this music, but after playing for a few minutes, I have to break off.

The only element of jazz that I keep is improvisation.