No chords ... gives you a lot more freedom and space to hear things. When you go this way, you can go on forever. You don't have to worry about changes and you can do more with the line. It becomes a challenge to see how melodically innovative you can be. When you're based on chords, you know at the end of 32 bars that the chords have run out and there's nothing to do but repeat what you've just done—with variations. I think a movement in jazz is beginning away from the conventional string of chords ... there will be fewer chords but infinite possibilities as to what to do with them.