Possible Clues:

• Musical with the song "The Gods Love Nubia"
• Verdi opus
• Musical with the song "Radames' Letter"
• Title slave of the stage
• Elton John musical based on an opera
• Opera by Giuseppe Verdi
• A slave of opera
• Help a thing for 23 down from Verdi
• 1871 Verdi opening
• 'Fortune Favors the Brave' musical