 In 1921 Sergeyev took over the post of "régisseur" to the Latvian National Opera Ballet in Riga, and during his appointment with the company he added a substantial amount of the music belonging to the notated ballets.Orchestral parts for some of the ballets was also added, such as "Paquita" by Eduard Deldevez, "The Little Humpbacked Horse" by Cesare Pugni, and Adolphe Adam's scores for "Giselle" and "Le Corsaire".In 1924, Sergeyev utilized the notation to mount Petipa's definitive version of "Giselle" for the Paris Opera Ballet, with the ballerina Olga Spessivtseva in the title role and Anton Dolin as Albrecht.