text: A musical genre developed in this country, the semi-opera, is sometimes performed today as an opera or a ballet.
full_question: A musical genre developed in this country, the semi-opera, is sometimes performed today as an opera or a ballet. A dancer from this country adapted the music of Cesar Franck into his ballet Symphonic Variations. Enrico Cecchetti founded a ballet school in this country in 1918. Ninette de Valois essentially founded the leading ballet company in this country. After leaving Russia, Anna Pavlova lived the rest of her life in this country. Frederick Ashton choreographed many productions in this country. For 10 points, name this country where ballets are staged in Covent Garden.
first_sentence: A musical genre developed in this country, the semi-opera, is sometimes performed today as an opera or a ballet.