- Ori Kaplan Trio Plus
- ORIGINAL PHALANX
- Ornette Coleman
- Ornette Coleman & Prime Time
- Ornette Coleman Quartet
- Orquesta de Instrumentos Autóctonos y Nuevas Tecnologías
- Orquestra Manancial da Alvorada
- Orra
- Otaconnor
- Otomo Yoshihide
- Otomo Yoshihide's New Jazz Ensemble
- Otomo Yoshihide's New Jazz Quintet
- Otravlennaya Klukva
- Ouici
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