Even if you're not into playing the family friendly Lego Rock Band, if you buy the game and pay a $10 fee, you can expand your Rock Band set list by 45 songs. From the announced set list for Lego Rock Band come the following details about exporting the songs:

Disc export will rely on the technology pioneered by Harmonix to export tracks from the original Rock Band disc to the music library of Rock Band 2. Owners of LEGO Rock Band on Xbox 360 and PlayStation 3 will be able to enter a unique code from an insert in their game manual into a dedicated website. The website will provide instructions allowing owners to unlock the export functionality of LEGO Rock Band. At that point, players will be able to export tracks from LEGO Rock Band to their hard drives for play in all game modes of the Rock Band Music Platform for a nominal export fee of $9.99 (800 Microsoft Points). An internet connection is required to perform this disc export.

All American Rejects, "Swing, Swing"
The Automatic, "Monster"
Blink-182, "Aliens Exist"
Blur, "Song 2"
Bon Jovi, "You Give Love a Bad Name"
Boys like Girls, "Thunder"
Bryan Adams, "Summer of 69"
Carl Douglas, "Kung Fu Fighting"
The Coral, "Dreaming of You"
Counting Crows, "Accidentally in Love"
David Bowie, "Let's Dance"
Elton John, "Crocodile Rock"
Europe, "The Final Countdown"
Everlife, "Real Wild Child"
Foo Fighters, "Breakout"
Good Charlotte, "Girls & Boys"
The Hives, "Tick Tick Boom!"
Iggy Pop, "The Passenger"
Incubus, "Dig"
Jackson 5, "I Want You Back"
Jimi Hendrix, "Fire"
Kaiser Chiefs, "Ruby"
Katrina & The Waves, "Walking on Sunshine"
The Kooks, "Naïve"
KoRn, "Word Up!"
KT Tunstall, "Suddenly I See"
Lostprophets, "Rooftops"
P!NK, "So What"
The Police, "Every Little Thing She Does Is Magic"
The Primitives, "Crash"
Queen, "We Are The Champions"
Queen, "We Will Rock You"
Rascal Flatts, "Life is a Highway"
Ray Parker Jr., "Ghostbusters"
Razorlight, "Stumble and Fall"
Spin Doctors, "Two Princes"
Spinal Tap, "Short & Sweet"
Steve Harly, "Make Me Smile"
Sum 41, "In Too Deep"
Supergrass, "Grace"
Tom Petty, "Free Fallin"
T-Rex, "Ride a White Swan"
Vampire Weekend, "A-Punk"
We the Kings, "Check Yes Juliet"
The Zutons, "Valerie"