Nirvana playing with various guest vocalists at the Music Hall of Fame awards has been pretty well publicised, but apparently afterwards they played a very raucous show in a tiny club in Brooklyn with same singers.

For anyone who's not seen it, this performance of Heart Shaped Box with St Vincent is awesome. Really ragged (probably because they were all apparently completely wasted) and raw.

http://m.youtube.com/watch?v=NkNmPWZijKk