What sound does a black hole make? As it turns out, they sing the deepest note ever generated in the cosmos, a B-flat rippling across space at 57 octaves below the keys in the middle of your standard piano. This universal music dances with the gas in the Perseus galaxy cluster, solving a long-time mystery on why these type of clusters never chill. Not only that, but studies show that a symphony of notes are much like music we’d hear on our radios. Listen long enough and you’ll hear the entire bridge of David Bowie’s “Space Odyssey.”