Don't know how long this will last, but on digg.com tonight there was a link to some great mood music audio files. I have a broaband connection and was able to download all of them in about 20 minutes. Nice selection of different times lengths, from short to long.
The link is below. When you click on a file, it will open a new browser window with embedded Quicktime. Wait until the white bar loads all gray, then right click on the player and choose "save as source" which will save the file as an .mp3:
http://www.zreomusic.com/download
