I saw Nate Smith + Kinfolk in London a few years ago. I have never seen such ensemble work. I used to think that mistakes were a bad thing, but in this kind of stuff if you are not making mistakes you are not trying hard enough. There was the odd musical ripple but they rode them with a smile and easy grace. It was just sublime.
There was Miles Davies in the Festival Hall in London in '91. The whole band was astounding. I stood there thinking "what he is playing makes no sense, and yet it is fabulous". I felt like I was walking on air for 3 days afterwards