via Joystiq: http://www.joystiq.com/2011/03/31/onebiggame-assembles-17-game-composers-for-album-to-benefit-chil/
Composer list:
* Michiel van den Bos (Unreal, Deus Ex, Overlord),
* Allister Brimble (Alien Breed, Rollercoaster Tycoon, Hydroventure/Fluidity)
* Marc Canham (Far Cry 2, Driver II-IV, Split/Second)
* Andrew Curnock (Escape Vektor, Pop, Avatar: The Last Airbender)
* Jason Graves (Dead Space Series, Command & Conquer IV: Tiberian Twilight, Prey 2)
* James Hannigan (Harry Potter series, Command & Conquer: Red Alert 3, Evil Genius)
* Akari Kaida (Breath of Fire III, Megaman BN series, Onimusha 3: Demon Siege)
* Frank Klepacki (Command & Conquer series, Blade Runner, Universe at War)
* Masaya Matsuura (Parappa the Rapper, Vib-Ribbon, WINtA)
* Peter McConnell (Psychonauts, Grim Fandango, Brütal Legend)
* Mike Reagan (God of War I-III, Darksiders, Spider-Man 2)
* Chris Rickwood (Age of Empires Online, Global Agenda, Ghostbusters: The Videogame)
* Bart Roijmans (Club Penguin: Elite Penguin Force, Aliens in the Attic, Dragonhunters)
* Cris Velasco (God of War I-III, Prototype, Clive Barker's Jericho)
* Christopher Tin (Civilization IV, Pirates of the Caribbean Online, Cars Online)
* Jonathan vd Wijngaarden (Adam's Venture, Fairytale Fights, Sims Medieval Facebook)
* Inon Zur (Dragon Age series, Prince of Persia, RIFT)