- The Overpriviliged -- The Owens' Project
- The Owl Ensemble -- The Oxford Concert Party
- The Oxford Farm Report -- The Ozarks
- The Ozzard of Wiz -- The Pacific Jazz Alliance
- The Pacific Jazzmen -- The Package
- The Package -- The Paducah Patrol
- The Pagan Jug Band -- The Pahinui Bros.
- The Pain Machinery -- The Painted Faces
- The Painted Id -- The Palace Lido
- The Palace Orchestra -- The Palisades
- The Palladinos -- The Pan African Orchestra
- The Pan-Atlantics -- The Panda Band
- The Pandanus Club -- The Panic Division