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Jazz trio refers to small‑ensemble jazz built around three musicians whose conversational interplay and improvisation are the focus. The most common configuration is the piano trio (piano, double bass, and drums), but the organ trio (Hammond organ, guitar or sax, and drums) and guitar trio (guitar, bass, and drums) are also canonical. Repertoire ranges from blues and Great American Songbook standards to bebop, hard bop, modal, and original compositions. The format emphasizes timbral economy, interactive time feel, and spontaneous arrangement—often following a head–solos–head structure with trading fours or eights and flexible codas. Feels include swing, straight‑eighth ECM‑style textures, bossa/samba, jazz waltz, and odd meters, with dynamic nuance and space being as important as virtuosity.