While in Stockholm , he was appointed to the royal chapel , and later also as an opera singer at the Royal Swedish Opera .
Still in his early twenties , in 1793 Du Puy traveled throughout the Holy Roman Empire , Poland and Sweden as a violinist .
While in Stockholm , Du Puy was appointed to the royal chapel , and later also as an opera singer at the Royal Swedish Opera .
Still in his early twenties , in 1793 Du Puy traveled throughout the Holy Roman Empire , Poland and Sweden as a violinist .