What is this interval called in terms of relative scale degrees?
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1Just as a side-note, you might be better off writing this as a Bb and an F#, if you want people to actually play it. That's an augmented fifth. – AJFaraday Mar 06 '16 at 00:35
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4This is a lot like asking, "How do I render an acute, a grave, a circumflex and a tilde above the same vowel?". A guru for some typesetting engine might be able to give you an answer, but it's a quite useless feat except for displaying "mad typesetting skillz". The thing you want to achieve simply doesn't occur in any reasonable text. – Kilian Foth Mar 06 '16 at 22:13
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@KilianFoth: That actually would be useful if you're in a metal band (though you'd probably want them over a consonant, rather than a vowel). – cjm Mar 08 '16 at 06:32
2 Answers
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When you come across something like this, you should remove all the accidentals and add them one at a time:
- C- E: major 3rd
- C- E#:augmented 3rd
- C -Ex: double augmented 3rd
- Cb- Ex: triple augmented 3rd
- Cbb-Ex: quadruple augmented 3rd.
Which I doubt you'll ever meet, even if it exists. Most likely it'll be Bb -F# which is a augmented 5th interval or Bb - Gb which is a minor sixth.
Shevliaskovic
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It would be a quadruply augmented 3rd and would be written as AAAA3.
C to E alone is obviously a major third (M3). From there realize that by adding a double sharp to the E you increase the distance by two semitones the and the resulting interval C to E♯♯ is a doubly augmented third (AA3). From there you can see by lowing the C two semitones results in the interval being increased by two more semitones resulting in the quadruply augmented 3rd.
Doubly augmented intervals in general are rare as seen in this question, so I doubt you'll see it outside a theoretical context.
