His studies in composition began in 1941, and his teachers included Alfredo Sangiorgi [it; fr] and Goffredo Petrassi.
After receiving his diploma in 1954 again at the Conservatorio Santa Cecilia, he attended the Darmstadt summer courses from 1955 to 1962.
Important influences during this period included meeting Bruno Maderna in 1956, and working at the electronic music studio of the Italian radio broadcaster RAI in Milan.
[2] In 1983 David Fanning described Clementi's style of decelerating canons as "sharing in the widespread post-serial depression of the 1970s",[3] while in 1988 Paul Griffiths referred to the "Alexandrian simplicity of his solution to the current confusion in music.
[4] Clementi himself described his works as "an extremely dense counterpoint, relegating the parts to the shameful role of inaudible, cadaverous micro-organisms".