Take a look at this tech piece at USAToday:
http://www.usatoday.com/tech/news/2005-08-03-yahoo-music-search_x.htm?csp=34
Then take a look at the search page here:
http://audio.search.yahoo.com/
I was able to locate some tracks I didn’t know were available – at Rhapsody, where I think I need to get a membership…! I also found some Fleetwood Mac tracks stored on a server for download… It looks as though this is a free for all: music services, podcasts, MP3 sharing sites. Let the debate and discussion begin!