Theory explained https://andrewhennington.wordpress.com/2015/10/22/j-s-bach-prelude-no-1-in-c-major-bwv-846/
Tonic cord - the root cord
Supersonic: the second note in a normal 8 note (heptatonic: 7 pitches) scale
Phrase- usually 4 bars long, ending in some form of a cadence. The first phrase ends in a imperfect authentic cadence
Authentic cadence goes from the dominant to the tonic. Perfect cadence has tonic the highest tone in the final cord. Imperfect does
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