At E3 2009, MTV Games and Harmonix revealed 10 of the 35 tracks to be included in The Beatles: Rock Band. The tracks revealed are among The Beatles' best known songs. With tons of Beatles downloadable tracks planned for after the game's September 9 release, it's IGN's guess that the game will include the best-known tunes.
IGN culled through the entire Beatles catalogue and selected the songs they think are going to make the cut. If these songs do make it, it's going to be interesting to see how some of them are implemented in the game. It would be shocking if "Hey Jude" wasn't including in the game, but that's a piano song. The Beatles: Rock Band does not come with a piano.