Maelstrom

Because it isn't trolling.

And because Robinjessome told Dan to make this thread.

And, yeah I think that the people who claim that jazz is complex... are right. There are many wacky chord progressions that you don't see any where in pre-1900 music simply because it was frowned upon to do such a thing.

And don't say that improvisation is necessarily an on-the-spot process. If you look at the transcribed and chord-mapped solos of famous jazz musicians, you'll see that what is improvised is actually highly logical, smooth, and coherent. They write pieces on the spot. This same thing happens in classical music too, btw.