A further two children meant that he had to travel to write and he had spells in Canada, Italy (with the RAI TV series K 2 +1, directed by Luciano Emmer, starring the Kessler Sisters and Johnny Dorelli), and Hollywood as well as working for British television and continuing to contribute to Punch.
In 1958 he won the Sanremo Festival in duo with Domenico Modugno, with the songs "Nel blu dipinto di blu" (also known as "Volare") and "Piove (Ciao ciao bambina)".
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Then, Chelli achieved a major fame on stage, starring in a number of successful musical comedies such as Rugantino (1978, together with Enrico Montesano), Cyrano (1979, with Domenico Modugno), and Aggiungi un posto a tavola (1990, with Johnny Dorelli).