Other
Musicards.net: Online Music Theory Flash Cards
Flash cards are an excellent way to help you learn various topics. These online music theory flash cards can help you learn note names, intervals, notes on the piano and several other topics.
Music Theory
Music theory.net: Generic Intervals
A thorough description of generic intervals with a printable chart at the end of the lesson. MusicTheory.net provides illustrated examples, and highlighted vocabulary terms. (You may need to download Flash Player to view this site.)
Music Theory
Music theory.net: Interval Trainer
This online quiz is a fantastic tool to check your knowledge of intervals. Keeps score, and can be customized to fit specific lessons (augmented intervals, diminished intervals, double accidentals.)
Music Theory
Music theory.net: Generic Intervals
A description of intervals and how they are used in music. Provides audio clips and illustrated examples to supplement this lesson.