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Avatar Consultants, Inc: Tuning, Scales, and Temperament
A discussion of the composition of complex sounds produced by a musical instrument. Good illustration of how music is applied to physics. Quite a bit of good information, several pages linked together with good definitions as well as...
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Bob's Byway: Glossary of Poetic Terms
Calling itself "unique," Bob's is easy to use, with cross-links throughout, phonetic pronunciation guides when necessary, and many examples and quotations. Click on the letter and scroll for the word.