They’re probably evil intervals, but sometimes they make sense! 
WHAT HAVE YOU DONE?!
(This is a little joke based on a very testy thread about diminished unisons.)
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Oh, yes! That was an amazing thread that made my head hurt.
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We wouldn’t want to start a “Tone-ist” argument about whether the “resonance” of the tone is G# or Ab. (One of my daughters gave me the book series “Sythe” as a gift) -