And I've listened to that solo 200 times, and I still like it.

The next song, or the encore, that I'm going to play is called Bumble Boogie, by Jack Fina.

So, actually, if you listen carefully, there's supposed to be five variations on this Abegg theme.

It's written around 1834, so, even though it's old, I hope you like it.

So he's now playing the piece that we just saw just a little better than I wrote it.

And of course and of course, if the piece is long and you've had a long day, you might actually drift off.

The name Abegg Abegg is actually A B E G G, and that's the main theme in the melody.

Now, Chopin didn't want to reach the E there, because what will have happened? It will be over, like Hamlet.

Now, am I sure that every single person followed that, understood it, was moved by it? Of course, I can't be sure.

These are contrast maps that are showing subtractions between what changes when you're improvising versus when you're doing something memorized.

Because for me, to join the B to the E, I have to stop thinking about every single note along the way, and start thinking about the long, long line from B to E.

And then you have to do the initial sketch of the character, which is like your structure of a piece, and then you add pen and pencil and whatever details that you need that's polishing the drawing.

Now what we did was we brought a musician into the scanner same way had them memorize this melody and then had another musician out in the control room trading back and forth interactively.

The excitement from using multi tracking, the way I did in the piece you will hear next, comes from the attempt to build and create a whole universe with many diverse layers, all generated from a single source.