In what century was the the style of voices popular that the Liebeslieder Walzer, Op. 52 was in?
Ländler The Ländler (] ) is a folk dance in  time which was popular in Austria, south Germany, German Switzerland, and Slovenia at the end of the 18th century.
Albert Reiss Albert Reiss (22 February 1870 – 19 June 1940) was a German operatic tenor who had a prolific career in Europe and the United States during the first third of the twentieth century. He spent much of his career performing at the Metropolitan Opera where he sang in more than 1,000 performances, including several premieres, between 1901–1919. Excelling in the tenor buffo repertoire, Reiss was particularly associated with the roles of David in Wagner's "Die Meistersinger von Nürnberg" and Mime in Wagner's "Der Ring des Nibelungen", two roles he sang in numerous houses internationally.