Bob Keller's Jazz Page
http://www.cs.hmc.edu/~keller/jazz/
Bob has made a truly incredible music search engine
If you can't find an answer in Google to a music question
you will find the answer in Bob Keller's Jazz Page
the links are grouped into categories from tunes, to music calculators. Music software with many hundreds of links.
Bob has a background in both Computer Science AND music/jazz
visit his website
http://www.cs.hmc.edu/~keller/jazz/