Perhaps some similar source of music triggers the door mechanism?

[ It's as good a lead as any, since there aren't any other routes of egress that he can see. Stephanivien turns his focus to following the noise, treading carefully across the swiftly-submerging floor, before arriving at one of the many mounds of debris and junk. He first nudges aside a larger broken beam with his foot, pulling up his thick smithing gloves, and then begins to reach through the mess trying to sort through. It's mostly waterlogged junk, or broken bits of furniture, but he keeps digging through the pile. ]

I suppose the question then becomes if the music is meant to accompany the sound or counteract it.

[ He's distracted enough as he's digging that he starts to hum a soft tune of his own, under his breath. ]