Update 10 years later: Now you can play Rock Band, Rock Band 2, Rock Band 3, Green Day Rock Band, The Beatles Rock Band, and LEGO Rock Band using the RPCS3 PS3 emulator.. You can also play any Rock Band / Guitar Hero game using the Dolphin emulator (the downside is the graphical and sound quality), and any Guitar Hero game on RPCS3 with the sound desynchronised, but if your computer is strong To play the Xbox version, you can simply plug the end of the controller cable into an existing USB port on your computer. To use a guitar from Guitar Hero Live, you must first connect the guitar to your computer via built-in Bluetooth, or you must purchase a Bluetooth dongle. The Guitar Hero Live console controller works with any console.
The RedOctane Guitar Hero II SG Controller is one of the best Guitar Hero controllers on the market. Not only is it affordable and well-known, but it is well built and comes with all the essential ports you’d want a guitar controller to feature. It features the regular five keys on the fret, which you use to play Guitar Hero or any other game.
King sepiroth13 and -dark_Palladin- are both correct you have to get a guitar to play the gutar in the game and the Xbox 360 Controller does classifies you for you as doing the vocals. Hope that Helps for you. x360 link: http://www.x360ce.com/how to get bonus songs:

GUITAR HERO III: LEGENDS OF ROCK is the first truly cross-platform Guitar Hero, with versions for PlayStation 2, PlayStation 3, Xbox 360, and the Wii. Using a special guitar controller, you play along to a song by pressing the neck and \"strum\" buttons in time to the music.

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can you play guitar hero 3 with a controller