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Start with the letter names - E-F-G-A-B. That's going to be a 5th - of some sort. Drop the E down a semitone, the interval's an augmented fifth. If, instead, the B goes up a semitone, that's also an augmented fifth. So, by dropping E to E♭, and taking B to B♯, it's a double augmented fifth interval. Which sounds exactly like a far more common major 6th.


I would say Eb - B# is a doubly augmented fifth. The letter name distance says it's a fifth: E - F - G - A - B, five different letter names (staff positions). You probably already knew this, but just for future readers: what you call the interval depends on what you call the notes. As you can see from ...

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