Few musical genres have managed to create a production structure as solid as that of zarzuela, the hegemonic genre of Spanish musical theatre spanning the 19th and 20th centuries. Companies toured not only in Spain, where they created zarzuelas in Spanish, Catalan and Basque, but expanded to Latin America, the United States and even the Philippines. Composers such as Amadeo Vives and Federico Moreno Torroba and librettists such as Guillermo Fernández-Shaw would be amongst the mainstays of the genre, which went into its final decline in the 1950s.