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If I had a test question?

694 Views 3 Replies 3 Participants Last post by  Amadeus Tentacles, 
Amadeus Tentacles
If I had a test question and it was to correctly name this interval - C to F Flat - Would either of these answers be correct? This is just for future reference.

- C to F Flat is a diminished Fourth
- C to F Flat is a Major 3rd

Sense it names C to F flat which is a fourth would I have to say its a diminished Fourth? Or could I say its a Major third because a major third is consisted of C, D, E, and just having that flat C - F flat would make it fall on a E.
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Yes, it's a diminished fourth. As Gordontrek said, the interval number is determined by spelling. That's the rule, no matter what.

When naming intervals, watch out for double sharps and flats. For example, keep in mind that C to A double-flat is a diminished sixth, not a perfect fifth.

This rule about spelling might seem crazy! But it is actually quite logical. It indicates the tonal function of each note in relation to the scale/key that is being used.
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