The trio began to perform once a week on Radio Jornal do Brasil, starting in 1946. In 1948 Klein returned to classical music and studied with William Kapell in New York City and with Bruno Seidlhofer in Vienna. In 1953 he won first prize at the Geneva International Music Competition, which launched his international career.
The trio commenced weekly performances on Radio Jornal do Brasil in 1946. In 1948 Klein returned to classical music and studied with William Kapell in New York City and Bruno Seidlhofer in Vienna. In 1953, he won first prize at the Geneva International Music Competition, which launched his international career.