After studying the violin privately, Porrino obtained a diploma in Composition at the Academy of Santa Cecilia, Rome, in 1932, subsequently making post-diploma studies with Ottorino Respighi.

The Sonzogno catalogue includes his first and last operas, Gli Orazi (1941, Teatro alla Scala, conducted by Antonio Guarnieri, with Tancredi Pasero and Iva Pacetti in the leading roles) and I Shardana (1959, Teatro di San Carlo, Naples), and the oratorio Il processo di Cristo (1948-49).

• Sketch by Pietro Marussig for the first performance of Gli Orazi (1941, La Scala, Milan)
• Costume designs by Malgari Onnis, wife of the composer and a noted painter, for the first performance of I Shardana (1959, Teatro San Carlo, Naples)

• PORRINO Ennio Concerto dell'Argentarola Solo 00h 16' 00"
• PORRINO Ennio Gli Orazi Operas 01h 00' 00"
• PORRINO Ennio I Shardana Operas 01h 50' 00"
• PORRINO Ennio I Shardana, preludio Symphonic 00h 07' 00"
• PORRINO Ennio Il processo di Cristo per soli, coro, organo e orchestra Symphonic 00h 50' 00"
• PORRINO Ennio L'organo di bambù Operas 00h 00' 00"
• PORRINO Ennio Monte Circeo, lirica per tenore e pianoforte Chamber 00h 03' 00"