There are very few universals among music around the world, such as pitch, accent, syncronization among instruments, melodic expression based on singing, and perhaps a few more. From the truly special performances that I have been part of, that could more or less be objectively called as such (we all felt it, as did the audience) theory meant little to nothing. Tempo variations, no functional harmony, fluid/changing time signature/accent, all occurred, with syncronization/timing being more or less constant, and boldness to trust musical instinct and ears and fellow band member's were the dominant themes of these performances. Whenever i try to argue for these over theory and aesthetic/mathematical/metronomic "symmetry", it always boils down do the idea that my instincts are perhaps not what i think they are, but from decades of playing live music, the more I rely on instincts, the more magical, deep, and meaningful musical experiences I have. So no longer am i self conscious about my abilities as a live musician and improviser. I try to be always be aware of my playing, but I can't let anyone get in my ear anymore and try to make me feel inferior for not following what they think music should be, because that can affect you as an artist.