I'd hazard that a good portion of the above isn't on most people's players

Hmmm... You just got me to thinking...

How about compiling a list of links to songs that artists/music labels have as free downloads. If somebody came up with a good well rounded list like that, then anyone who wanted to participate in the contest would just have to download the tracks. If somebody is going to take the time to organize a contest, it probably wouldn't be that much more work, and it would make it possible for everyone to have the same tracks.

Of course, a post like this wouldn't be complete without a track as a suggestion, so here it is: Diamond City by Phero.