Parallel to his useless literary studies at the University of Naples, Giulio D'Alessio studied baroque music at the conservatories of Lyon and Geneva where he obtained the « Diplome de Soliste ». He continued to study with Sigiswald Kuijken at the Conservatory of Brussels, where he received a Master degree in Baroque Violin.
He joined Kuijken's Petit Bande, for which he played for many years as well as Il Complesso Barocco, of which orchestra he quickly became manager. He plays the violin, viola, mandolin, viola da gamba, viola d'amore, and the violoncello da spalla, without, however, ever achieving technical and musical brilliance in any of them. His solo performances were greeted with critical silence, whether he played with "La Petite Bande", the "Scarlatti Orchestra of Naples", or the "Salzburg Soloist Chamber Orchestra". This silence led to his decision to dedicate himself to other activities. Thus in 2007, along with Ewald Demeyere, he founded the Bach Concentus orchestra, aimed at the rediscovery of the repertory of the Bach family. He also directed the staging of Handel's Lotario and Rodelinda at the Teatro Arriaga in Bilbao and created the scenes for the theater presentation, "Monologue for Editor," written by Flavio Pagano for the "Festival of the Vesuvian Villas." These varied and entirely schizophrenic activities have led him to approach the world of contemporary art and have led to a collaboration with the writer Flavio Pagano, leading to the creation of impressive, however useless, works of interactive art which soon will see the light of day.
From 2011 he is the artistic director of Inspiratum ( Antwerpen). In 2011 he founded with Gesine Lübben, the orchestra Il Pomo d’Oro.
Since 2005, he has lived in Venice, where he devotes himself to the raising of his children and to row in the Venetian style. His current dream, no doubt not to be realized, is to become a gondoliere."