Today around noon, the 20-member Alarm Will Sound band (who most recently performed Steve Reich's Radio Rewrite) surprised Metropolitan Museum patrons with a musical flash mob in the Charles Engelhard Court. The troupe performed "Cliffs" by Aphex Twin—a minimal, theatrical piece with a gorgeous slow build-up that will put you in a trance.

Here's some initial video of the performance from our man on the ground, Jon Reznick... sadly, The Met's video won't be release for months, so if you shot some video of this today, send it along!