a pattern of chords that is repeated throughout a song
A series of chords used to harmonize a melody or to provide a basis for improvisation
a series of chords sounding one after another
A series of chords that blend well with the melody they accompany.
A chord progression (also chord sequence and harmonic progression or sequence), as its name implies, is a series of chords played in order. Chord progressions are central to most modern European-influenced music. Compare to a simultaneity succession.