Music Quizzes and Puzzles:
http://library.thinkquest.org/4116/Music/quiz.htm
Rock'N Roll Trivia:
http://www.brownielocks.com/rocknrolltrivia.html
IROK2 is sort of like Rock Band but for your PC:
https://www.irok2.com/signin
Flaunt your talent with this free online karaoke website!
http://www.singsnap.com/?AM1&gclid=CJTO4d3gw6oCFYfCKgod5QkI7Q
