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John Gläser (12 June 1888 – 27 May 1968) was a German operatictenor,voice teacher and Theaterfunktionär. His career as a performer spanned from 1911 up until 1942, after which he became a singing teacher in his later years.
Born in Berlin, Gläser was already a soloist of the Hof- und Domchor before he began his real singing studies in Berlin. His stage career started in 1911 atTheater Ulm. After that he was at theLandestheater Altenburg (Thuringia) and came to theWrocław Opera in 1912. Five years later he went to theOper Frankfurt, where he stayed until the end of his career. In Frankfurt he sang among others Elis on 21 January 1920 at the premiere of the operaDer Schatzgräber by Franz Schreker. Guest appearances took him to Berlin, Munich, Hamburg, Vienna and to theSalzburg Festival of 1926, where he sang Bacchus inAriadne auf Naxos.[1] p. 1750 On the occasion of his 25th anniversary in Frankfurt in 1942, he gave his last performance as "Canio" inPagliacci. After that he continued to work as a singing teacher. From 1961 to 1963 he was also honorary president of theGuild of the German Stage.