The concordant (or consonant) combination of notes sounded simultaneously to produce chords. Countermelodic notes to accompany a tune.The vertical dimension of music, referring to the notes sounding together. Often abstracted to mean sets of pitches thought to sound well together. (1) the study of progression, structure and relationships of chords (2) when pitches are in agreement, or consonance<br><br>The way in which chords are arranged in a musical composition.<br><br>The study of simultaneously sounding tones