Matt Bellamy in Guitar Hero 5

In the BBFC classification of Guitar Hero 5, they mention an interview with Matt Bellamy as being part of the work submitted to them to be assessed.

In previous entries, interviews hidden in the games have usually been with musicians who have contributed something further to the game than just their songs, such as when Tom Morello and Slash had character models made for them, provided motion capture, and composed music for the boss battles.

BBC article (scroll down to Guitar Hero 5)