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Originally Posted by DubyaJoe
How is this so? A major seventh is just a B in the key of C and a minor seventh is a Bb in the key of C. Diminished is a Bbb in the key of C...it's the same rule as a third or a second.
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Bbb is the same enharmonically compared to A, which is the major sixth of C.
The only time when that rule differs is when looking at a perfect 4th or 5th, as a major/minor 4ths and 5ths don't exist. A diminished 5th is just a half step less than a perfect 5th and is the same an augmented 4th.
Edit: I didn't realized Havic mentioned this... Also, I'm not too familiar with describing diminished/augmented octaves/unisons or anything. Funny, it was never really mentioned (except augmented unison once, i think)... the important ones are the 4th and 5th...