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Bernadette Peters - Broadway's Best
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'fifth interval question'
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#beginquote# I'm trying to study some music theory on my own. I have a book that says that on the C major scale, the fourth (C-F), fifth (C-G), and octive (C-C) intervals are perfect intervals because they can not be flatted. If says that sharping or flatting those intervals is called augmenting or diminishing respectively. I think I understand why the fourth and octive intervals cannot be flatted, there are no black keys on the keyboard with which to flatten the F or the C. But I don't understand why the fifth interval is said to not be able to be flatted. There is the black key one half step left with which to flat it (G flat or F sharp). So why is the fifth considered a perfect interval? #endquote#
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