 The latter role proved to be his first undisputed stage success, probably because it was free of elaborate coloratura passages, which were not considered to be his strong suit as a vocalist.In 1831, in Lucca, Duprez took part in the premiere Italian performance of "Guglielmo Tell", singing for the first time (in an opera theatre) a high C sung not in the so-called falsettone register, as other tenors of that time were accustomed to do, but with a full voice, often described as coming "from the chest".His Italian career then proceeded on a highly successful course.