| http://www.w3.org/ns/prov#value | - Heller has appeared at major opera houses across the United States and Europe, including the Metropolitan Opera, Los Angeles Opera, the Deutsche Oper Berlin, and many others in such r??les as Rodolfo, Pinkerton, Cavaradossi, Duca di Mantova, Alfredo, Riccardo, Don Jos?? and others.
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