Waltz from the operetta "Wo die Lerche singt" ("Where the Lark Sings") Waltz from the operetta "Wo die Lerche singt" ("Where the Lark Sings") Main opus "Wo die Lerche singt" ("Where the Lark Sings"), operetta in 3 acts, libretto by Alfred Maria Willner and Heinz Reichert