William Castaldi begin his trumpet studies with Gioacchino Giuliano, principal trumpet of the Bellini Theatre in Catania
His orchestral career starts in 2008 with the " Orchestra Giovanile L.Cherubini", founded and directed by Maestro Riccardo Muti.
In October 2010, he wins the audition for the "Accademia della Scala" in Milano.
With this orchestra, he takes part in numerous tour all over the
world (Russia, Denmark and Arab Emirates) playing as principal trumpet
under the baton of several world-famous conductors like Gustavo Dudamel, John Axelrod and many more.
In December 2010 he decides to continue his studies in Denmark at The Royal Academy of Music in Aarhus under the guidance of Prof. Kristian Steenstrup.
He also takes part in several masterclasses with Reinhold Friedrich, David Bilger, James Watson and many more.
Really important stone in his carrier was the opportunity to play Don
Pasquale opera by Donizetti as principal trumpet at la Scala opera house
under the conducting of Enrique Mazzola. And after that an Italian
tour with la scala academy orchestra under the conduction of maestro Yuri Temirkanov playing Mussorgsky masterpiece: pictures at an exhibition
In 2012 he keeps passing audition for extra trumpet in several Italian opera
house: Teatro Alla Scala, Orchestra del Teatro Massimo Bellini di Catania, Teatro Lirico di Cagliari, Teatro Regio di Parma.
Just two weeks later he passes the audition at Teatro Massimo di Palermo and Fondazione Teatro Lirico di Cagliari, where he used to play also like a principal trumpet.
In April 2014, he got the second prize at the "international music
competition " città di Pesaro.
He collaborates also with the Orchestra of Santa Cecilia in Rome.
in 2015 He wins both principal and Second trumpet position at Teatro Petruzzelli di Bari.
In 2017 he performed the Weinberg Trumpet Concerto as soloist with the Brussel Philharmonic during Klara Festival, leading Festival for Classical music in Belgium.
Lately, he won the audition of principal trumpet for the Orchestra Sinfonica Siciliana and Teatro Carlo Felice di Genova
Recently he had collaborated as Guest Principal trumpet with the Antwerp Symphony Orchestra
In October 2019 he got a Trial for the Principal Trumpet Position at the Goteborgs Opera (Sweden)
In the March of 2020, he performed as soloist the Weinberg Trumpet Concerto in Brno with the Brno Philarmonic
Since 2009 he is the artistic director of the International trumpet masterclass held in Sicily