happenstance theory

English sites

Hooktheory develops innovative tools to help people learn and teach music.
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Introductory and intermediate music theory lessons, exercises, ear trainers, and calculators.
Melding philosophy and spirituality in the fewest possible words
Helping TOK students around the world to read between the lines
Online reading activities for all levels. Improve your reading ability using this fun, interactive, educational tool in school or at home.
The resource site for A First Look at Communication Theory.