Russell 72: "Music is a remarkable pure artistic example of the total interdependence of theory and practice*, because music (properly conceived) is not 'about' anything other than Time, the ultimate ground of all reality. Music is about the time it occupies, and the way we perceive that time, and situate ourselves in it."
*- "realtime improvisation [is] philosophically more fruitful than composition imagined as a separate activity" and similarly, "merely playing without conceving of the activity in a mindful way is equally barren"