"Wenn zwei sich lieben", duet from the operetta "Der Rastelbinder" ("The Apprentice Tinker") "Wenn zwei sich lieben", duet from the operetta "Der Rastelbinder" ("The Apprentice Tinker") Main opus "Der Rastelbinder" ("The Apprentice Tinker"), operetta in 2 acts and 1 prelude, libretto by Victor Léon