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General Music Resources
A great on-line metronome to practice with!
Practice sight reading.
This is a virtual piano which is especially helpful for percussionists to practice mallets if you don't have a bell kit or keyboard at home.
Great site with games and info about music theory. It also has an excellent ear training game.
Music Racer Great games for naming notes and learning fingerings for your instrument!
Music Trainer Great games for general musicianship
Staff Wars A Great game for learning how to read notes in your clef!