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.
Wachet auf, ruft uns die Stimme, BWV 140 Wachet auf, ruft uns die Stimme (Awake, calls the voice to us), BWV 140 , also known as "Sleepers Wake", is a church cantata by Johann Sebastian Bach, regarded as one of his most mature and popular sacred cantatas. He composed the chorale cantata in Leipzig for the 27th Sunday after Trinity and first performed it on 25 November 1731.