I have removed the direct links to the song files because of all the chaos with copyrighted music violations, etc. etc. I DO NOT want to violate any copyrights, so I removed the files in advance.
Anyways, some other places to listen to song files are: Listen.com, Broadcast.com and SonicNet.com (sites that work with WebTV are GetMusic.com and MusicPlex.com).
There are a ton of song files on the Net, you just have to search for them! Places to search directly for song files can be found at AltaVista.com AND Lycos.com.
There is a site that has a lot of songs in Real Audio format. It is called The Sterba Music Jukebox and you can find it here