Apparently Kurt Cobain wrote this song after a marathon day of listening to Meet the Beatles ! ..
Well.. I guess that listening to the Beatles for the whole day won't necessarily allow you to write a classic such as this..
But still, the formula is easy, four chords and a story to tell..
When they rehearsed it, Chad Channing , Nirvana's 1st drummer, asked him which was the name of the song..
Best comment in youtube
"my brother said nirvana sucked, i slapped him. "