He was also active as a choir director and as a teacher of "choral exercises" at the Giuseppe Tartini Conservatory of Music in Trieste (1971–2001).
From 1982 he was a member of the Società Italiana degli Autori ed Editori the Italian Society of Authors and Publishers (SIAE).
Giampaolo Coral was essentially self-taught, but his spiritual teachers were Arnold Schoenberg and Franco Donatoni, with whom he had a long friendship.
The same year, through the Chromas Association, he created the festival entitled "Trieste Prima – International Encounters with Contemporary Music."
He wrote four musical theatre shows for radio, one of which was performed, directed by Giorgio Pressburger, at the "Atelier sur la prise du son dans le théâtre radiophonique", held in Hilversum by the Union Européenne de Radiodiffusion.