Music theory: All music must follow a carefully constructed set of rules pertaining to notes, scales, chords, rhythm, melody, harmony, and form.
Jazz: Hold my beer...
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oooohhhh....
okay, you all know that's not what theory is, you don't need me to point it out...........
but, man, students come in with that idea fixed in their heads, and, oy, the crowbars required.....