Nite, in Bach's time, they used what was called "figured bass" to improvise the keyboard parts along with the orchestra. It was numbers.

http://en.wikipedia.org/wiki/Figured_bass


You've got to know your limitations. I don't know what your limitations are. I found out what mine were when I was twelve. I found out that there weren't too many limitations, if I did it my way. -Johnny Cash

It's only music.
-niteshift

Mike Dunbar Music