This is a Surround Sound sample DVD-Video/DVD-Audio hybrid disc. It is an ISO image that can be burnt to a DVD+/-R. It contains 3 songs each having been encoded in Dolby Pro Logic II, Dolby Digital, DTS, and MLP. It will allow you to hear the differences between all 4 surround sound formats.
In order to hear the uncompressed MLP surround sound audio tracks you'll need to play the disc in a player that supports DVD-Audio.
You can download individual surround sound files here: http://www.kellyindustries.com/sounds.html