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The reason we care about the degree of a note in the scale, is because we can use it to talk about different kinds of chords in a sequence
For the each key we can talk about it's chords. A good way to think about some songs, is major chords numbered by degree of the note. That way we can talk about the same chord progression in different keys.
hence, chord progressions can be written as numbers 1 - 6 A chord progression and key unlocks your capacity to see the music matrix