Even before I explain what this is, I have to give a massive shout out to Diablocon on Scorehero for compiling the following information from the Gamescom video released by Harmonix today. He pulled the difficulty ratings for each instruments for most of the Rock Band 3 songs (with a few exceptions where the screen was obscured)!

He also notes the following items:

Of these songs, 14 don’t have keys. Of these songs, only one doesn’t have guitar. The Who are now the only band to have been in every numbered Rock Band game. However they are tied for most on disc appearances with the Foo Fighters and Bon Jovi if you count LEGO Rock Band.

The list is long (83 songs long), so I’ve included it after the jump!

Note: ? are where the video was obscured, and N is where the instrument is not used for the song.

Artist Song Guitar Bass Drum Keys Vocal Amy Winehouse Rehab Anthrax Caught in a Mosh N At the Drive-In One Armed Scissor N Avenged Sevenfold Beast and the Harlot N B-52's Rock Lobster The Beach Boys Good Vibrations (Live) Big Country In a Big Country Chicago 25 or 6 to 4 The Cure Just Like Heaven David Bowie Space Oddity Deep Purple Smoke on the Water Def Leppard Foolin' Devo Whip It Dio Rainbow in the Dark Dire Straits Walk of Life Echo & the Bunnymen The Killing Moon Elton John Saturday Night's Alright for Fighting Faith No More Midlife Crisis Filter Hey Man Nice Shot N Flaming Lips Yoshimi Battles the Pink Robots Pt. 1 Foreigner Cold as Ice Golden Earring Radar Love HIM Killing Loneliness Huey Lewis and the News The Power of Love Hypernova Viva la Resistance N Ida Maria Oh My God INXS Need You Tonight J. Geils Band Centerfold James Brown I Got You (I Feel Good) Janes Addiction Been Caught Stealing N Jimi Hendrix Crosstown Traffic Joan Jett I Love Rock N' Roll John Lennon Imagine N Juanes Me Enemora Lynyrd Skynyrd Free Bird Metric Combat Baby ? The Muffs Outer Space N Night Ranger Sister Christian Ozzy Osbourne Crazy Train N Paramore Misery Business N Phish Llama Phoenix Lasso N The Police Don't Stand So Close to Me Poni Hoax Antibodies Pretty Girls Make Graves Something Bigger, Something Brighter Primus Jerry Was a Race Car Driver N The Smiths Stop Me If You Think You've Heard This One Before ? The Sounds Living in America Spacehog In the Meantime ? Steve Miller Band Fly Like an Eagle Stone Temple Pilots Plush ? N Swingin' Utters This Bastard's Life T.Rex 20th Century Boy ? Tears for Fears Everybody Wants to Rule the World Tegan and Sara The Con Them Crooked Vultures Dead End Friends ? Tokio Hotel Humanoid Tom Petty and The Heartbreakers I Need to Know The Vines Get Free N War Low Rider Warren Zevon Werewolves of London The White Stripes The Hardest Button to Button N Whitesnake Here I Go Again ? The Who I Can See for Miles N Yes Roundabout

[Diablocon on Scorehero via @toymachnesh]