Foo Fighters frontman Dave Grohl spoke in an interview with Team Rock and explained why he couldn’t play drums after Kurt Cobain died. He said:
“After Nirvana, I wasn’t really sure what to do. I was asked to join a couple of other bands as the drummer, but I just couldn’t imagine doing that because it would just remind me of being in Nirvana; every time I sat down at a drum set, I would think of that. And other people would think of that as well.
I thought, what do I do? Do I even play music any more? I don’t know. Maybe that was it. Maybe it’s time to do something else. Maybe real life starts now. Because at that point I had been touring in bands since I was 18 and I’d seen the world and got to be in this huge band.
When I was young, someone played me the  ‘Klark Kent’ record that Stewart Copeland had done. I thought how cool that he could make a record and people can listen to it objectively because it wasn’t Stewart Copeland from The Police, it was ‘Klark Kent.’
That’s kind of what I wanted to do. There were some songs I’d recorded in my friend’s studio while Nirvana was still a band and an independent label in Detroit wanted to release something.“
Click here to entire interview.