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We talked a little bit about the sharp four and the flat five, now I'm just going to go
off on the flat five for a minute. If we take C, E, G, we have a major triad, we know that
from before, it's easy, right? Right? Now if I lower the next one in the series to a
minor triad, it's going to be C, E flat, G. If I lower, once again, we discussed this
before, the five, I'm going to get C, E flat, G flat. So that's where the flat five comes
from, and it doesn't really occur, I mean, you could throw it in, but it sounds more
like a sharp four in that situation where you're actually using a Lydian mode. So it
wouldn't really happen like when there's a major third present, but I think that you'd
begin to get the picture with this one, you have to look at the diminished triad to get
the best picture of what a flat five really is.