Answer:

fidelio

AnswerCrossword Clue
FIDELIOBeethoven's only opera
FIDELIOOpera featuring a "grave-digging duet"
FIDELIOOpera about the steadfast wife of a political prisoner
FIDELIOBeethoven opera
FIDELIOBeethoven's only opera.
FIDELIOOpera famous for Leonora overture.
FIDELIOOpera set in Seville
FIDELIOOpera featuring the "Prisoners' Chorus"
FIDELIOOpera subtitled "Wedded Love"
FIDELIOVienna premiere of 1805
FIDELIOOpera that inspired the T-shirt slogan
FIDELIOOpera that includes the "Prisoners' Chorus"