Four hundred programmers, all in the same room, tapping away intermittently at their big, loud, mechanical keyboards. Swirling about the room as some people start cranking out the code at high speed, some pause to think and debug. You can hear when the whole team is in the groove and bringing that Lines Of Code metric up, but the sound of that one person thoughtfully, slowly, refactoring, and deleting reams of now-obsolete source vanishes in the rattle.
Nobody speaks. Nobody plays music. There is just the Clacking.