After accompanying jazzmen in his childhood, Petit went to the Conservatoire de Paris, where he studied harmony and counterpoint.
He did the string arrangements for Mink DeVille's Le Chat Bleu album, as well as orchestrating the backing parts to some French pop singles in the mid-to-late 1960s, including those of Erick Saint-Laurent and yé-yé girls Christine Pilzer and Monique Thubert.
The song was popular in Italy due to its use in the soundtrack of a well-known Carosello (the Italian TV spot broadcast) from 1973 to 1976.
In 1976 he collaborated with Pierre Delanoë, Toto Cutugno, Vito Pallavicini in a very popular and funky music for Mireille Mathieu called Ciao Bambino, Sorry.
In addition, he was a frequent collaborator with French film music composer Jack Arel: the pair's most well-known production, "Psychedelic Portrait", was featured in an episode of the cult TV series The Prisoner.