Classical Music Online

There are free downloads of MP3s of classical music from Deutsche Velle (which looks to be Germany's version of the BBC) here. Click on the Classical Masterpieces Link.
For downloads that are tethered to your computer, there are more downloads here (from Cincinnati's Public Radio). You can find the William Tell Overture (the Lone Ranger theme song) or Aaaron Copland's Rodeo (that's the song that they played on the "Beef -- It's what's for dinner" commercials years ago, among other songs.