O.

O. is a London-based duo formed of saxophonist Joseph Henwood and drummer Tash Keary. The group is active from 2021 and works across experimental music, jazz and jazz rock, with tags also placing it in art punk, nu jazz and avant-garde territory.

The act is built around the pairing of saxophone and drums, with Henwood and Keary listed as the members. Its compact line-up and instrumental focus place it within the wider London experimental and jazz scene.