Misc: What US city was called The Birthplace of the Skyscraper?

Questions

(It.) - Incisive.?

- A modernistic principal since 1945 of leaving elements of performance to pure chance (see aleatoric music) or letting performers decide when to play certain passages. Berio, Cage and Stockhausen used this concept in their compositions.?

- A neverending canon popularly known as a round (e.g. Three Blind Mice).?

(It.) - English.?

(It.) - In the style or manner of.?