Dallapozza was trained as a clerk and started work in a book shop. At the same time, he studied singing - among his teachers was the Italian-born soprano Ida Valjalo - and sang in the chorus of the
Vienna Volksoper. At the Volksoper, he sang in his solo debut in 1962 the role of Ernesto in Donizetti's opera
Don Pasquale. In the German premiere of Bernstein's
West Side Story in 1968, directed by
Marcel Prawy, Dallapozza sang the role of Tony opposite
Julia Migenes. That year, he was engaged at the
Vienna State Opera, but the Volksoper remained his home for the rest of his career. Until 2008, he had sung in 1,893 performances in 74 different roles there. In 1984, the Volksoper made Dallapozza an honorary member. He was well known for his secure possession of the high c. ==Repertoire==