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Jazz: A style of music of Afro-American roots characterized by a strong rhythmic under structure, blue notes, and improvisation on melody and chord structure.

Jew's Harp: Also called jaw harp: A twanging sound is produced by holding this U-shaped instrument between the teeth. Movements of the mouth alter the pitch of the sounds produced.

Jubilate: A song of praise, usually based on Psalm 100.

Just Tuning: Any system of tuning in which the intervals are pure, and do not deviate from the overtone series.