This is Sigur Rós doing "Svefn g englar." (Which the Web's preeminent authority says is an Icelandic pun). Uploader JRandall says it was recorded in Philadelphia on September 22nd, 2001. Also, it's about eleven minutes long. These things may or may not have anything to do with anything.
If the recent asteroid and the water bears have filled you up with enough space for a while, probably best to save this one for later.
(h/t: Reihan Salam, in a tangential way)