The Guitarist is referred as main player's character (See Characters), Brad Whitford and/or the female Guitarist in Guitar Hero: Aerosmith.
He or She appears in every Guitar Hero game (with the exception of Guitar Hero Live since it's The Guitarist's POV.), Only in Guitar Hero: Aerosmith, Brad Whitford is the second Guitarist in Aerosmith in the game and when it's a non-Aerosmith song, there's a female Guitarist.