He graduated in singing at the Conservatory Claudio Monteverdi in Bolzano (Italy)[2] where he studied with Vito Maria Brunetti.

At the age of 22 he was discovered by Claudio Abbado who chose him to play the role of Ferrando in Mozart's Così fan tutte.

[citation needed] He worked with Franco Zeffirelli, Woody Allen, Peter Stein, Graham Vick, Willy Decker, Deborah Warner, Luca Ronconi, Kasper Holten, David McVicar, Ferzan Ozpetek, Mario Martone, Michael Haneke, Robert Carsen.

[citation needed] Pirgu won the first prize in the international competitions Caruso in Milan in 2002, and Tito Schipa in Lecce in the same year.

[citation needed] In December 2015, he released his album Il Mio Canto, edited by Opus Arte.