For 10 points, identify this art form consisting of sounds, one of whose greatest theorists was John Cage.
Theodor Adorno laid out the ideas of the culture industry in a work that examines a "popular" form of this activity. Eduard Hanslick wrote that "moving forms in essence" is what makes up "the beautiful" in this activity. One theorist on this activity pointed out how Meyerbeer's The Prophet is an example of "Jewishness" in this activity. In his book Politics, Aristotle argued that this activity and gymnastics were productive of virtue and can dispose the mind to any emotion. Pythagoras argued that the intervals used to measure this activity were linked with movements of divine bodies, which has been termed "the [this] of the spheres." For 10 points, identify this art form consisting of sounds, one of whose greatest theorists was John Cage.
Theodor Adorno laid out the ideas of the culture industry in a work that examines a "popular" form of this activity.
music [prompt on art, accept harmony and anything involving music being made, such as "playing music"]