Spotting playback in a script
Playback shows up whenever the story's music is part of the performance:
49 INT. KESTREL BAR - NIGHT
Karaoke night. Ana grabs the mic and belts out the
chorus of "Crimson Highway." The crowd sings along.
Cole, at the bar, can't help smiling.
| Box | Entry |
|---|---|
| Music (brown) | "Crimson Highway": pre-record Ana's vocal in prep; instrumental + guide track for playback |
| Cast | 5. Ana, 3. Cole |
| Background | 25 BG patrons, singing along (omnies) |
| Special equipment | playback system, speakers, earwigs for Ana |
| Crew | playback operator |
| Notes | song cleared (sync + master or re-record)? Karaoke screen lyrics may need VFX |
That's a scene that starts in prep. The song has to be licensed or written, Ana may need to record her vocal in a studio, and the playback file has to be prepared with timecode so the editor can sync it.
How playback runs on the day
The production sound mixer or a dedicated playback operator runs the tracks. For lip-sync, the performer sings along to their own pre-recorded vocal, loud enough to match on camera. Each take starts from a marked point in the song so the edit lines up, and a timecode slate or audio slate identifies where. For dance scenes, playback runs on speakers during wides and on thumpers or earwigs when dialogue has to be recorded over it.
Background singing along is a different matter. Crowd voices in unison are usually treated as group noise, but a background actor directed to sing a solo line may trigger an upgrade on a union show. See background actors.
Other sound items in the brown box
The same breakdown category covers non-music sound needs: a phone that must ring on cue, a radio broadcast the actors react to, a baby crying off camera, a gunshot that performers need to hear. Some of these are played live on set so actors can react; others are added in post and the scene is noted as needing a cue on the day. Scenes shot without sound at all are marked MOS.
Mistakes
The expensive mistake is shooting a performance of a song that hasn't been cleared. If the rights holder says no or quotes a price the budget can't carry, the scene may need a reshoot with a different song. Get clearance started as soon as the breakdown flags a named track. The other common mistake is forgetting the playback operator and equipment on the call sheet, which leaves the sound mixer running playback from a phone and a borrowed speaker.