"Es muss gelingen...", aria of Hans (act 2, scene 5) from the comic opera "Prodaná nevesta" ("The Bartered Bride") "Es muss gelingen...", aria of Hans (act 2, scene 5) from the comic opera "Prodaná nevesta" ("The Bartered Bride") Main opus "Prodaná nevěsta" ("The Bartered Bride"), Comic opera in three acts JB 1:100