Kurt Cobain always had this humility to him that permanently exempted him from the rock star ego no matter how big Nirvana got. It comes through especially on these acoustic takes where he performs the songs that come from more personal places, like "Pennyroyal Tea". He even screws up the key at one point but keeps going. It's as though he's just sat down to demo a new song with some friends even though he's playing in front of God knows how many people and being professionally filmed at the same time. Man always kept his cool. He might not have been the most expert musician but he sure knew how to set a mood. 

I've always loved "Pennyroyal Tea" for its simple rawness. It's a perfectly curtailed expression of a sickly state of boredom, that kind of itchiness you get when there's something in you that's permanently sick or constantly agitated. Kurt wasn't one to complain or seek pity about his problems but he sure did turn them into some great, pathos-infused songs. The mellower jams on In Utero always struck a few chords with me when I was in high school and still resonate somewhere even now that I'm bored and old. Here he is playing live and acoustic in 1993.