I Could Have Danced All Night was the 24th most performed song of the 20th century.
Wide Eyes
Dancers have better than average peripheral vision. Head angles are prescribed by the dance, so dancers have to use their eyes themselves if they want to look to the side, without turning their heads.
Destructors
Many historical waves of dances were perceived as the "destructors" of the old way of dance. Examples of that can be found in the 1920's Charleston and the era of Rock music.
