Individual songs from some of the operettas have become standards, notably "Vilja" from The Merry Widow and "You Are My Heart's Delight" ("Dein ist mein ganzes Herz") from The Land of Smiles.
Single songs from some operetta are now standard, like "Vilja" from The Merry Widow and "You Are My Heart's Delight" from the Land of Smiles.