Was born in Turin, Italy, in 1953. He has begun his musical studies with Azio Corghi, Piero Provera and Enrico Correggia at the Conservatory of his native countrv. Then he went to Milan Conservatory and received a Bachelor in Music degree in Composition studying with Giacomo Manzoni.
He has written composition awarded in some competitions and broadcasted by some Radio and TV in Europe and in other countries.
His works has been performed in the leading music reviews both in Italy and abroad including "Nuova Consonanza" and "Nuovi Spazi Sonori" in Rome, "Cantiere Internazionale" of Montepulciano, "Aterforum" of Ferrara, "Europa Musica" of Candia, "Festival Pontino", "Rassegna del Gruppo Musica Insieme" of Cremona, "Nuova Musica" in Genoa, "Settembre Musica" and "Antidogma Musica" in Turin, festivals of Certaldo, Naples, Imperia, Amsterdam, Berger, Aarhus, Braunwald, Buenos Aires, Los Angeles, Salisburgo and others.
His first opera "Boine", libretto by Giuseppe Conte, commissioned by Associazione "Teatro Tempo", was staged in 1983 during the 3rd Festival of Imperia and was revived in several italian theaters.
The "Nederland Wind Ensemble" performed during a tournée in Holland and United States one composition for winds of his, in the same year a piece for viola had its first performance in New York and then was repeated in some american cities.
His works had been performed at "Festival Estival" of Paris at St. Martin in the Field in London, during the concerts of "I Pomeriggi .Musicali di Milano", at "Darmstadt Ferienkursen", at "Bayreuth Festival" and have their first performance at "35th Festwochen" of Berlin, as well as at Teatro "Verdi" of Sassari: here was staged "Games", a ballet in seven scenes that was repeated in several italian cities.
G. Possio is president of Studio ES (Experimental Electroacoustios) of Milan.
His works are published by Rugginenti, Ricordi, Edipan, Accordi and Carisch.
He teaches Composition at the Conservatory of Turin and is artistic director of the Publishing Rugginenti of Milan.