Title: Reading a tweet by Tommy Collison¹ reminded me that the best book I have read about musical harmony is practically unknown²<p>What are the best unknown books you read?<p>¹ <a href="https:&#x2F;&#x2F;twitter.com&#x2F;tommycollison&#x2F;status&#x2F;1215008546657423361" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;tommycollison&#x2F;status&#x2F;1215008546657423361</a><p>² <a href="https:&#x2F;&#x2F;www.amazon.com&#x2F;Harmony-its-systemic-phenomenological-aspects&#x2F;dp&#x2F;B0000E8F1U" rel="nofollow">https:&#x2F;&#x2F;www.amazon.com&#x2F;Harmony-its-systemic-phenomenological...</a>
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