ウィーン・フォルクスオーパー
As a guest artist, Grundén appeared also at the Royal Opera, in Stockholm, in lyric tenor roles in opera and operetta. He made a particular success in the role of Symon in "Der Bettelstudent". In 1953 he joined the company of the Vienna State Opera, appearing in opera and operetta roles. His roles there included the title part in "Fra Diavolo", Paris in "La belle Hélène" and Danilo in "The Merry Widow", through 1955. He also performed at the Vienna Volksoper. In 1958, his contribution to music in Vienna was marked by his appointment as Kammersänger. He left the Vienna Volksoper in 1963, but returned to make guest appearances.