A theatre starts making sound about an hour before curtain — first the stagehands, then the orchestra warming up in the pit, then the slow build of audience chatter as seats fill. These 31 theater sound effects work that whole arc: house-light murmur of a settling crowd, the hush right before the lights drop, the slow heavy rumble of a stage curtain rising on its track, ovation applause at three intensities, and the warmer ambience of a movie theater between trailers when popcorn is louder than any voice.
Stage-play foley reaches for the curtain rise and the audience murmur for opening montages. YouTube intro work uses the short applause bursts as celebration cues without sounding like a sitcom laugh track. A film-within-a-film scene built on the movie theater sound effects bed — projector hum, distant audience laughter, the soft pop of seat hinges — sells the location before any character speaks. Pull what fits; the whole theater sounds collection is free to download with no licence chase.