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It has embedded youtube videos of examples. I certainly didn't have that in my 20th century theory text books and it would have been very helpful!

This resource looks excellent

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Exactly. It is hard to explain how great this is unless you tried to learn this by just looking at staff notation with having no idea what the sound actually was.

Literally like trying to learn color theory without vision.

Especially if you're not a pianist. I play a monophonic instrument, so even though I did plenty of piano, it sure it wasn't up to "casually sightreading examples from the literature" level.

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