What interval is a to e flat?

Answer 1

It's a Double Diminished Fourth.

Rename A# to Bb (or Db to C#) and you have the more common Minor Third. Change them both and you get an Augmented Second. They all sound the same (in equal temperament tuning at least).

Answer 2

C to A is a major 6th, but because the C was sharpened at the same time the A was flattened, the order goes like this.

C - A = M6

C sharp - A or C to A flat = m6

C sharp to A flat = d6 (d being diminished).

The interval between C sharp and A flat is a diminished 6th.

Answer 3

On the piano keyboard, the e and f keys are next to each other, an interval of a semitone. Sharping f increases the interval to a whole tone, then flatting e increases the interval to a minor third, three semitones.

If you are not working in equal temperament, however, there are two (at least) sizes of semitones and whole tones, (the common pairs are named major and minor) and it becomes important to know the temperament or intonation system used, what note it is based on, and where in the scale e-flat and f-sharp lie. Most people who venture into these kinds of "microtuning" systems are very aware of the intervals they are using, however.

Answer 4

It is a minor 5th or more commonly called a tri-tone.

Answer 5

A perfect 4th.

If the Key is A Flat, then C# is enharmonic to D flat, therefore making the interval a perfect 4th.

Answer 6

G♯ to Fx is a major seventh, as seen in the G♯ Major scale, it goes;

G♯, A♯, B♯, C♯, D♯, E♯, Fx and G♯.

Answer 7

If Eb is higher, it's a perfect fifth. If Ab is higher, it's a perfect fourth.

Answer 8

It is a diminished 4th.

Answer 9

Doubly-augmented unison.