Spectacular
Game that keeps you hooked for days, takes awhile to master but keeps you playing until you do.
Unlockable guitars allow you to work hard towards better scores on songs and when you finally do unlock a new guitar, it gives you a since of accomplishment.
This game is really just amazing.
A few things to improve it would be more songs and possibly a song creator. A song creator would allow users to really get more interactive with the game. You can't go wrong. Other then that, great!