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OK, so here's an interesting point about the seventh chords and how they come from the
scale. You may have noticed, when we played the C sharp scale, that every note is sharp.
Just as in the C scale, every note is natural. So, when we play C sharp, and we go up to
it's third, it's E sharp in the key signature. But, it's really easier to think of it as
F when you're playing a seventh chord. So we play C, E sharp which is F, G sharp, and
then C natural on top. Which in the key signature for C sharp is called B sharp, but it's really
C natural. So we could go C sharp, F, G sharp, C natural. Makes major. We lower that C on
top to a B natural when we get dominant seventh. You lower the third to an E and get minor
seventh. The fifth from a G sharp to G and we get half diminish. And the seventh to B
flat for fully diminish.