Among the glut of underground Nirvana demos that have been unearthed in light of Montage of Heck, there’s this nine-minute jam jewel that deserves special attention. The song, spotted first by Stereogum, is called “E-Coli,” and it kind of sounds like someone has really bad food poisoning — in the best way. (Perhaps Yoko Ono and Nirvana were more alike than we initially thought?) Stream it while it lasts, and don’t forget to sing along when appropriate.