Han var gjestesanger ved Covent Garden i London, i Paris-operaen og la Scala i Milano.<ref>«Graarud», AftenpostenOpera News'': [https://books.google.com/books?id=LwAFAAAAMAAJ&q=%22Gunnar+Graarud%22&dq=%22Gunnar+Graarud%22&hl=en&ei=t8W8TPGOI4bMswau0vjLDQ&sa=X&oi=book_result&ct=result&resnum=4&ved=0CDMQ6AEwAzgK "Graarud, Gunnar", Vol. 26, 1961, p. 150,