Harmonix and MTV unveiled the first set of downloadable songs available for the upcoming "Rock Band" videogame. The game goes on sale Nov. 20 with a full playlist included. But from day one, users will immediately be able to download extra songs for $2 each or in three-song packs for $5.50 each. They include tracks from Metallica, The Police, Queens of the Stone Age, Foreigner, Wolfmother and The Runaways, among others. Additional songs will become available on a weekly basis, the company said.