In Co-Op Career mode, the players only perform the first six tiers, do not encounter any Boss Battles, and have different Encore songs from the Solo Career mode. However, this option is only available for the first two boss battles (Slash and Tom Morello). The player must attempt the Boss Battle three times, but after the third time the player has the option of passing the Boss Battle in order to continue progression in the game. During the Solo Career mode, the player will also encounter three Boss Battles, a new mode introduced in Guitar Hero III, at the ends of three tiers as listed below, prior to performing the Encore song. The player(s) must complete some or all of the songs in one tier (based on the career difficulty selected), including the Encore, to access the next one. These songs are arranged in eight sequential tiers based on their relative difficulty.

Guitar Hero III features 73 songs spread across both the Solo and Co-Op Career modes. The Xbox 360 and PlayStation 3 versions each had an exclusive song. Four downloadable songs were only available for a limited time. As of September 12, 2008, there are 59 songs available as downloadable content for both platforms, bringing the total number of available songs for these versions to 132. The Xbox 360 and PlayStation 3 versions support downloadable content in the form of new songs for the game. Guitar Hero III features 73 songs on the game's media this includes the 39 single-player songs, three 'Boss Battle' songs, six co-op career exclusive songs, and 25 bonus songs. The game was released on the PlayStation 2, PlayStation 3, Wii, and Xbox 360 game consoles, and also for Microsoft Windows and Apple Macintosh personal computers. This game is the first in the series to be developed by Neversoft, and was distributed by RedOctane and Activision. Guitar Hero III: Legends of Rock is the third release in the Guitar Hero series of music video games.

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