 Throughout the rehearsal period the score was under constant revision by Delibes, often with the "aid" of Mérante and Rita Sangalli who would each dance a lead rôle.This development of the score was a grueling process of many revisions and restarts.Mérante was especially demanding of Delibes and would regularly request changes to the score to accommodate his choreography, yet Léo Delibes made the changes requested of him in a timely fashion.