Another good addition to a gym would be a few tool cd's. Throw in some Ac/dc and Led Zeppelin. Try to get digital music express or something like that instead of radio stations, which are annoying. DO NOT play any music featuring Nelly, Janet Jackson, Eminem, Spice girls, Puff Daddy......
DO PLAY Bush, Aerosmith, AC/dc, Led Zeppelin, Tool, Kiss, Radiohead, Redhot chilipeppers, etc.!