Free music-theory tutorials and interactive practice for ear training, reading music, chords, scales, and rhythm. Give your ears some homework.
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Tutorials explain the ideas, and the exercises give you somewhere to test whether they have actually stuck.
The practice covers listening as well as notation, so recognising an interval is not limited to knowing what it looks like on paper.
The browser resources are free and supported by donations. You can start practising without buying a course or making an account.