Well there are:

1. (is rather) a Blank style, just your midi plays.
2. All midi styles where only midi plays and the BIAB styles have patterns and an A style and B style buried in there that you can manipulate.
3. RealTracks where there is no actual style, just try and match tempos and feel, like swing in a group you can call your style.
4. A group of RealTracks where pg music called the shots and put together a style.
5. Combinations of the above.

So in effect from pgmusic you have midi styles, RealTracks styles, and crosses of the above.

In the end you get control over a vast array of stuff!

John Conley
Musica est vita