This song is called "Oh me."

"Oh me" is a cover. that means it's not by nirvana. it's originally by the meat puppets. i don't care 

if it's from nirvana or meat puppets; the lyrics just speaks with my soul and nirvana gives the sparkle

 around the (in my opinion) perfect wrapped heart shaped box (sorry, but kurt owned a totally cute collection of them). everything is in this box what a pure music lover needs;

 passion, beautiful lyrics, acoustic guitars and a talented singer.

In my opinion it's a great song and i can calm down with this song. not like "don't worry, be happy :-) " but it have got something that i can't explain it in words. i guess, you need to listen to nirvana's unplugged album, then you could judge it better.