Gazzelloni was the principal flautist with the RAI National Symphony Orchestra in Turin for 30 years and dedicatee of many works.

[1] Composers including Luciano Berio (Sequenza I for solo flute, 1958), Pierre Boulez, Bruno Maderna and Igor Stravinsky wrote pieces for him.

Some of his notable pupils include jazz player Eric Dolphy, classical flautist Abbie de Quant, flautists Ann Cherry and Carol Wincenc, composer Norma Beecroft, and audio engineer Marina Bosi.

Dolphy honoured Gazzelloni by naming a composition for him which he included in his 1964 Out to Lunch!

[3][4][5] In summer 1976 he toured through Italy, performing with classical pianist Bruno Canino and a jazz combo that included Enrico Intra (piano), Giancarlo Barigozzi (tenor saxophone), Pino Presti (electric bass), Tullio De Piscopo (drums), and Sergio Farina (electric guitar).