Maybe the list that can be found on the following web site will be of some interest. Click on the “Top 200” button. This list, complied in late 2000, charts a broad spectrum of music that mobile DJ’s agreed were their most requested songs or selections needed to produce a successful event.
It does list 200 songs, rather that the 100 you were asking about, but it's a place to start.
If it works for DJ’s, it ought to work for keyboard players as well.
http://www.justmusicdj.com/ Paul C.