The first one will be familiar to almost all of us, the new interpreted Tristram theme from The One Ups. Some of you may know them already from other works they have made, all focusing on different game's melodies, take a gander on their site to listen to their songs. Those who can't get enough can even download the "Tristram Live" straight from their MySpace as long as you have an account of said site.
The other song should also be familiar to anyone who has paid interest to Blizzard lately. The iTunes store has the "Diablo III Overture" in its selection now, which can also be heard on the gameplay trailer of the game. This is also a free download, to get it all you must have is a US iTunes Store account to download this.
Fans will definantley appreciate these pieces of art, so don't miss out on it, go check it out now!