Vertical blocks of different tones which sound simultaneously.

The simultaneous combination of pitches, especially when blended into chords that are pleasing to the ear.

The sounding of two or more notes at the same time. A composer may be said to have a 'harmonic language', similar in meaning to saying someone has a particular accent.

Pleasing combination of two or three tones played together in the background while a melody is being played. Harmony also refers to the study of chord progressions.