There's like this combination of a deep knowledge of music, a very comfortable and tactile relationship with his instrument, and this sensitivity that he's listening and reacting. He's not, like, sticking to a plan of, 'I know what I can do, and this will work.' He's listening. And there's this river of music inside of Jeff—all the stillness and the violence and the chaos and the absolute ethereal beauty that he can bring to music through his playing.