sentence: roles gisela geldmaier , art history student ( soprano ) gennaro esposito ( tenor ) hanspeter schluckebier , vulcanology student ( baritone ) the german general consul ( bass ) another female tourist ( soprano ) another male tourist ( tenor ) antonio scarlatti , inn keeper ( baritone ) a mime ( silent ) a female tourist ( mezzo-soprano ) circa 12 actors and mimes , playing hanspeter 's accomplices and the commedia dell ` arte group chorus synopsis gisela , a young student of art history from the city of oberhausen , visits naples with her boyfriend hanspeter and a group of superficial and arrogant students .