Alfredo Casella
Petrassi was born at Zagarolo, near Rome. At the age of 15 he began to work at a music shop to supply his family's financial needs, and became fascinated by music. In 1928, he entered the Santa Cecilia Conservatory in Rome to study organ and composition. In 1934, composer Alfredo Casella conducted Petrassi's "Partita" for orchestra at the ISCM festival in Amsterdam.