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.
Karl Amadeus Hartmann Karl Amadeus Hartmann (2 August 1905 – 5 December 1963) was a German composer. Some have lauded him as the greatest German symphonist of the 20th century, although he is now largely overlooked, particularly in English-speaking countries.