1. The concordant (or consonant) combination of notes sounded simultaneously to produce chords.
2. Countermelodic notes to accompany a tune.

SUGGESTED LISTENING EXAMPLES:

Harmony, Baroque:
Purcell: Come, ye Sons of Art, come away, "Chaconne"

W. W. Norton - 4-CD Musical Example Bank -- Disc 2, Track 55

Bach: Cantata No. 140, Wachet auf, BWV 140, "Er kommt, er kommt"

W. W. Norton - 4-CD Musical Example Bank -- Disc 2, Track 59

Bach: Chromatic Fantasia and Fugue in D minor, BWV 903 (opening of the fugue)

W. W. Norton - 4-CD Musical Example Bank -- Disc 1, Track 17

Harmony: Classical:
Mozart: Piano Concerto No. 21 in C major, K. 467, II (piano entrance)

W. W. Norton - 4-CD Musical Example Bank -- Disc 1, Track 4

Beethoven: Serenade in D major, Op. 8, I

W. W. Norton - 4-CD Musical Example Bank -- Disc 2, Track 28

Haydn: The Creation, "Achieved is the glorious work"

W. W. Norton - 4-CD Musical Example Bank -- Disc 3, Track 7

Harmony, Impressionist:
Debussy: Pelléas et Melisande, Act I, Scene 3

W. W. Norton - 4-CD Musical Example Bank -- Disc 3, Track 36

Ravel: Daphnis et Chloé (closing section of the ballet)

W. W. Norton - 4-CD Musical Example Bank -- Disc 3, Track 37

Harmony, Medieval:
Organum: Tu patris sempiternus et filius (three excerpts)

W. W. Norton - 4-CD Musical Example Bank -- Disc 2, Track 38

Machaut: Nesque on porroit les estoiles nombrer

W. W. Norton - 4-CD Musical Example Bank -- Disc 2, Track 39

Harmony, Renaissance:
Josquin Desprez: El Grillo

W. W. Norton - 4-CD Musical Example Bank -- Disc 2, Track 41

Palestrina: Missa in Festis Apostolorum I, "Agnus Dei"

W. W. Norton - 4-CD Musical Example Bank -- Disc 2, Track 42

Harmony, Romantic:
Wagner: Tristan und Isolde, Prelude

W. W. Norton - 4-CD Musical Example Bank -- Disc 3, Track 29

Brahms: Violin Concerto in D major, Op. 77, III

W. W. Norton - 4-CD Musical Example Bank -- Disc 1, Track 7

Chopin: Prelude in E minor, Op. 28, No. 4

W. W. Norton - 4-CD Musical Example Bank -- Disc 1, Track 16

Schubert: Gretchen am Spinnrade, D. 118

W. W. Norton - 4-CD Musical Example Bank -- Disc 3, Track 13

Harmony, 20th century:
Schoenberg: Suite for Piano, Op. 25, I

W. W. Norton - 4-CD Musical Example Bank -- Disc 3, Track 40

Glass: The Photographer, for Violin, Chorus, and Instruments, "A Gentleman's Honor"

W. W. Norton - 4-CD Musical Example Bank -- Disc 3, Track 75

Prokofiev: Classical Symphony, III

W. W. Norton - 4-CD Musical Example Bank -- Disc 3, Track 41