The Austrian tenor, Waldemar Kmentt, began his musical career as a pianist, and then studied singing at Vienna Academy of Music with Adolf Vogel, Elisabeth Rado, and Hans Duhan. While still a student he toured toured Holland and Belgium with ensemble of the Academy.
In 1950 Waldemar Kmentt made his formal debut in Vienna début was 1950 in L.v. Beethoven's 9th Symphony, and his opera début was in Vienna Volksoper in 1951 as Prince in Love for Three Oranges. He was a member of the Vienna State Opera from 1952, and his parts included Idomeneo and the Emperor in Die Frau ohne Schatten. He sang Jaquino in Fidelio in 1955, at re-opening of Vienna State Opera House. His Salzburg début was also in 1955 as Dandini in Palestrina, and his Bayreuth début in 1968 as Walther in Die Meistersinger. He also sang at the opera house of La Scala in Milano. As a concert artist, he sang widely in Europe as well. He acquired a fine reputation for his performances of works from the Austro-German repertoire.