Related Clues:

• Song that's often in a foreign language
• Diva's tune
• 'William Tell' component
• Battle number
• 'O terra, addio,' e.g.
• New aviator's hurdle
• "Pagliacci" piece
• Soprano solo, sometimes
• Role for Ford
• ''Habanera,'' for one
• Soprano's song, sometimes
• ''Vesti la Giubba,'' for one
• 16-Across's 'La donna è mobile,' e.g.
• 'Celeste Aida,' e.g.
• Flight training milestone