Italian conductor and composer. It was, probably, the only representative of Italy at the beginning of the 20th century that advocated at the same time an ideal international and nationalist. He started musically Bazzini and Martucci, and already over 13 years, moved to Paris to study with Leroux, Diemer and Fauré. During his stay in France, he came into contact with the international modern music. The different influences are reflected in his early works: the first two symphonies are reminiscent of Strauss and Mahler, while the following and the ballet Il Convento veneziano, Albéniz and Stravinsky. In a second stage, polishing his own style in works such as La Giara, Partita and Canzoni trecentesche. As Orchestra leader, started the career at the Concerts Populaires du Trocadéro (1912) and made several trips to America as a pianist and Orchestra conductor during his lifetime.
Casella has taught piano at the Paris Conservatory, activity developed from 1922 in the Conservatory of Santa Cecilia in Rome. In this city founded the Società Italiana de Música Moderna (1917), which became six years later Corporazione delle Nuove Musiche, section of the ISCM.