Clinton Marius started his career with the lead role in the one-act play by whom?
Clinton Marius:  He made his first professional appearance singing the lead role in Menotti's opera, "Amahl and the Night Visitors" at age twelve. Amahl and the Night Visitors: Amahl and the Night Visitors is an opera in one act by Gian Carlo Menotti with an original English libretto by the composer.
Gian Carlo Menotti