I dont think you can for PS2. You can for PC though cause I have :)
Yes, The full title of the game is "Guitar Hero III: Legends of Rock
Guitar Hero 2 Guitar Hero 3: Legends of Rock
Yes, a microphone can be used for Guitar Hero Legends of Rock in the same way it's used in other Guitar Hero games.
yes
yes.
guitar hero 1, guitar hero 2, guitar hero:encore rock the 80s, guitar hero 3:legends of rock, guitar hero:van halen, guitar hero world tour, guitar hero 5, guitar hero: warriors of rock!
Yes. You can use the "Rock Band" guitar for any "Guitar Hero" game, and vice versa.
no sorry
Legends of Rock
a Guitar Hero guitar controller will work for Rock Band. You could also use the wire less Rock Band Guitar on Guitar Hero III: Legends of Rock
yes it is
no, Lou was a Guitar Hero 3: Legends of Rock exclusive