For some reason I thought it unthinkable to cover a Nirvana song but I saw Thou end their set with an amazing cover of Aneurysm and it really blew me away....

They haven't recorded that (I don't think) but there's a rather crushing cover of sifting on youtube: http://www.youtube.com/watch?v=RXH2HrN1IBc

So link me up with really good nirvana covers.

(sincere efforts only..no novelty/orchestral teen spirit covers please)