: What is the interval between two enharmonic notes? The interval between, say, C4 and D4 is a major 2nd. What is the interval between B#3 and C4? Is it still a 2nd? For lack of a better term would it be something like

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You have:

B# - C: Diminished 2nd (same as B-Cb)
B - C: Minor 2nd
B - C#: Major 2nd (same as Bb - C)
Bb -C#: Augmented 2nd

If I'm not mistaken, there are also double diminished and double augmented intervals, like Bb - Cx but rarely used

Generally the interval qualities are: Diminished, Minor, Major, Augmented or Diminished, Perfect, Augmented.