The Guitar Hero III Companion Piece is a combination of two different products - a traditional soundtrack of music from the Guitar Hero III game and an expansion pack of songs for the game. This piece provides fans many of the key songs from the game as well as new songs/levels for them to play. The music portion of the companion piece will feature songs from Guitar Hero such as "Miss Murder" by AFI, "Kool Thing" by Sonic Youth, "3"s and 7"s" by Queens Of The Stone Age, and many more. The expansion portion for the game will literally be new levels for the game.