I know I'm not the greatest singer or guitar player.
I don't practice or rehearse. I decide I want to play a song, I look up the lyrics and play the song from memory. In cases like Alanis Morisette and The Smashing Pumpkins, I haven't listened to those songs since the 90's.
I hit record, play, and what happens, happens. Although my performances lack polish, i believe it is a truer form of Art because I'm not coming from a place of tons of practice and perfecting, it is spontaneous.