| Term | Description |
|---|
| Jarabe | The jarabe is one of the most traditional song forms of the mariachi genre. In the Spanish language, jarabe literally means syrup. |
| Jazz band | A jazz band (or jazz ensemble) is a musical ensemble that plays jazz music usually without a conductor. Jazz bands usually consist of a rhythm section and a horn section. |
| Jazz harmony | Jazz harmony is the harmonic idiom or harmonies used in jazz. |
| Jazz scale | A jazz scale is a musical scale used in jazz. Many "jazz scales" are common scales drawn from Western European classical music, possibly with an additional note inserted to add a jazz sound coloring, such as a particular chromatic passing tone as in the "bebop scales", or a blue note. |
| Jug band | A jug band is a band employing a jug player and a mix of traditional and home-made instruments. |
| Just intonation | In music, just intonation is any musical tuning in which the frequencies of notes are related by ratios of whole numbers. |
