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.
Alfred Deller Alfred George Deller, CBE (31 May 1912 – 16 July 1979), was an English singer and one of the main figures in popularising the return of the countertenor voice in Renaissance and Baroque music during the 20th century.