Harmonix just officially announced that the update allowing Rock Band songs to be transferred to Rock Band 2 has gone live. Once Rock Band 2 is released, drummers, vocalists, and plastic guitar players will be able to transfer 55 songs from the original game to the sequel for $5 (400 MS points).
55 songs? That sounds like it's missing a few tracks. The press release details -- in tiny print at the bottom -- that the missing songs are: "Enter Sandman" by Metallica, "Paranoid" by Black Sabbath (cover), "Run to the Hills" by Iron Maiden (cover) and "Monsoon" by Tokio Hotel (a DLC song from the European disc). Sorry folks, but we can probably take a guess as to why Harmonix couldn't re-license some of those tracks.