An orchestra was a group of musicians who played music for an audience.
Orchestras were often featured in the incidental music of television shows and movies. A television show being filmed in the Broadcasting House featured a ten-piece orchestra performing the incidental music for the show. (PROSE: Losing the Audience) A film viewed by Richard and Debbie also featured an orchestra in its incidental music. (PROSE: The Very Last Picture Show)
Isaac composed music for an orchestra. (PROSE: An Overture Too Early) One piece he composed amplified the effects of an anti-electron field operated by Hu. Because of this, it had the power to raze whole worlds. Isaac became trapped in a mirror by this effect, and was saved by his orchestra playing the song while Hu ran his generators. (PROSE: Resonance)