who invented the structure of the classic pas de deux
Pas de deux The ballets of the late 19th Century—particularly of those of Marius Petipa—introduced the concept of the grand pas de deux, which often served as the climax of a scene or an entire performance. This involved a consistent format of entrée and adagio by a pair of leading male and female dancers, followed by virtuosic solos (first by the male and then the female) and a finale.[3] During the 20th century, the grand pas de deux became more integrated with the story of the ballet, with increasingly acrobatic content.[3]