If you haven't discovered this yet, go check it out NOW. Staff wars is the greatest thing to be create for the secondary grades studying the music staff. It is a terribly fun game for the students (and the teacher).
To play the game you have to identify the music notes (in treble, bass or alto clef) and click on the correct note. You have three life lines, and the notes go by faster and faster.
In my room, I have the students divide into groups and have each player name a note one right after the other. That way everyone is responsible for contributing. We keep score of how many points each team receives. We've been having a running competition all year long.
I like to play star wars music in the background while we play too :-)
Download the software here: