Soon, Azpiazú's style was followed by other Cuban artists such as Armando Oréfiche and the Lecuona Cuban Boys, who had extensive international tours in the 1930s. Their style has been often described as ballroom conga, since they used to borrow conga rhythms in songs such as "Para Vigo me voy". Among their numerous hits were boleros and "canciones" such as "Amapola" and "Siboney". This music movement, which also included many American big bands that covered Latin standards, was dubbed the rhumba craze. Notable bandleaders of the rhumba craze include Xavier Cugat, Jimmy Dorsey, Nathaniel Shilkret, Leo Reisman and Enric Madriguera. Rhumba was also incorporated into classical music, as exemplified by symphonic pieces by composers such as George Gershwin, Harl McDonald and Morton Gould.