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A chord progression cheat sheet I made after discovering the greatness of the chord-numbering system. Once you know all the chords in any major scale you can use this number system to jam or write songs.
age 13 Music Theory for Songwriters - Home It has a chord map using Roman Numerals that shows every possible chord for Major scales and what chords they move toward. Very useful for someone that's trying to find some inspiration to spice up a song.