Bonelli started his career with a concert in 1941, followed by appearances at the theatres in Asti and Novi Ligure.
During April 1943, Bonelli appeared in Tosca at Foggia, then due to the war Bonelli interrupted his activity until December 5th 1945, when he appeared in La Bohème at the Municipale in Piacenza.
Bonelli returned to Piacenza in 1947 in Madama Butterfly. During the same period, Bonelli appeared at the Teatro del Popolo at Fiume in Tosca, work that Bonelli repeated in Pola, Zagreb and Belgrade together with Cavalleria, Traviata, Werther and Faust.
Bonelli returned to Italy at Piacenza (Teatro all'aperto Colombaia in Tosca), Firenze (Teatro Comunale in Madama Butterfly), Catania (Lucia), and Bergamo. In 1950, Bonelli sang in Asti, Marseille, Lyon and La Scala (Traviata, Oberto).
In 1951, Bonelli sang at Fiorenzuola (Tosca, Bohème), and Villanova (Concert). In 1952, Bonelli sang at Firenze (Pergola), Piacenza (Municipale in Bohème) and at Codogno (Sociale). Bonelli moved to South America, where he spent 2 years in Peru and Argentina.
In 1957, Bonelli was in Yugoslavia, singing also in Austria and Eastern European Countries. Bonelli returned several times to sing at Piacenza until 1964.
Thereafter, Bonelli stayed in Yugoslavia, until the end of 1973, when he retired.
Bonelli returned to Piacenza where he not only gives singing lessons, but also paints.