Beatles: Rock Band will ship with 45 songs in September. However, by the end of 2009, you'll have a lot more of their catalog to play.

Harmonix announced that they will release three albums by the Beatles as downloadable content in the months after the game's September 9th launch:

Abbey Road (1969) - Release Date: October 20, 2009

Pricing: $16.98 (or 1360 Microsoft Points for Xbox 360) for album, $1.99 (or 160 Microsoft Points for Xbox 360) for individual tracks.

• “Come Together”
• “Something”
• “Maxwell’s Silver Hammer”
• “Oh! Darling”
• “Octopus’s Garden”
• “I Want You (She’s So Heavy)”
• “Here Comes The Sun”
• “Because”
• “You Never Give Me Your Money”
• “Sun King”
• “Mean Mr. Mustard”
• “Polythene Pam”
• “She Came In Through The Bathroom Window”
• “Golden Slumbers”
• “Carry That Weight”
• “The End”
• “Her Majesty”

In addition, purchasers of the full album download of Abbey Road will have the option to play the famous 16-minute B-side medley as a single continuous track. The medley includes “You Never Give Me Your Money,” “Sun King,” “Mean Mr. Mustard,” “Polythene Pam,” “She Came In Through The Bathroom Window,” “Golden Slumbers,” “Carry That Weight” and “The End.”

Sgt. Pepper’s Lonely Hearts Club Band (1967) - Release Date: November 2009

• “Sgt. Pepper’s Lonely Hearts Club Band”
• “With A Little Help From My Friends”
• “Lucy In The Sky With Diamonds”
• “Getting Better”
• “Fixing A Hole”
• “She’s Leaving Home”
• “Being For The Benefit of Mr Kite”
• “Within You Without You
• “When I’m Sixty Four”
• “Lovely Rita”
• “Good Morning Good Morning”
• “Sgt. Pepper’s Lonely Hearts Club Band (Reprise)”
• “A Day In The Life”

Rubber Soul (1965) - Release Date: December 2009

• “Drive My Car”
• “Norwegian Wood (This Bird Has Flown)”
• “You Won’t See Me”
• “Nowhere Man”
• “Think For Yourself”
• “The Word”
• “Michelle”
• “What Goes On”
• “Girl”
• “I’m Looking Through You”
• “In My Life”
• “Wait”
• “If I Needed Someone”
• “Run For Your Life”

Also, the song "All You Need Is Love" will be available on the game's launch day through Xbox Live as well for 160 MS Points ($1.99). It'll make its way to other platforms eventually.