The music playing under the narrator's voice is from the introduction level to The End is Nigh. The game starts proper when you die in it, but there's also an alternate ending if you complete the level without dying where the protagonist never bothers participating in the plot.
credits
from ham2,
released August 31, 2020
Ridiculon - THE END IS NIGH - Retro Turkish March (Mozart 1783)
Kevan Brighting - [narration from The Stanley Parable]
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