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Tritones are these funny little beasts of an interval, they're exactly half as big as an octave, and if you invert them (take the bottom note and put it on the top) it's the distance between the two notes doesn't change. They're also super important to Classical Western harmony, because they only happen once in a major scale, between the 4th note of the scale and the 7th note, and they have a very strong resolution they pull to. The 7th scale note ALWAYS pulls up to the tonic (1st note of the scale), and the 4th will often pull down to the third. That pull of the 7th note is so important to Western harmony that we had to rework the minor scale to include it. Which is why you'll see lots of F#s in a piece in G-minor.

#ClassicalMusic #MusicTheory #Tritones