Reharmonization is a musical technique that involves altering the harmony of an existing melody. Synonyms for reharmonization include chord substitution, chord alteration, chord revoicing, and harmonic modification. Chord substitution is the process of replacing a chord with another chord of the same root or function. Chord alteration involves changing one or more notes in a chord to create a different sound. Chord revoicing involves changing the order or spacing of the notes in a chord. Harmonic modification involves changing the harmony of a melody by adding new chords or removing existing ones. All of these techniques can be used to bring new life to old melodies and create fresh and interesting musical arrangements.