harmony

/ˈhär-mə-nē/

Middle English armony, from Anglo-French armonie, from Latin harmonia, from Greek, joint, harmony, from harmos joint

noun

  1. the combination of simultaneous musical notes in a chord

  2. the structure of music with respect to the composition and progression of chords

  3. the science of the structure, relation, and progression of chords

She taught him how to sing harmony.

a song with complicated harmonies and rhythms