A chord progression refers to a series of chords that are played in a sequence. Progressions are used to add harmonic content to a song.
Harmony refers to the chordal basis on which the music is built.
A chord progression is a specific way through which chords move from one to another. It refers to a series of chords that are played sequentially.
Harmonies with more than three notes are called chords. Thus, it is helpful to choose a chord progression before developing the harmony.
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