Well, this is exciting. John Purkey, an old friend of Kurt Cobain's, recently uploaded four videos containing cassette recordings of Nirvana demos from the late 80's.
Purkey says that the cassettes were given to him by Cobain at the time. They consist of early recordings of songs that would eventually make it to Bleach, a few tracks recorded with Melvins drummer Dale Crover and some pre-Dave Grohl Nevermind demos that include Chad Channing on drums.
The tapes total around two hours of raw, unpolished material and well worth a listen.
We know you're busy people, so we've put all the videos - including Purkey's captions - below for your listening pleasure.
Enjoy: