| "Nixon in China," for example | 39 |
| "Nixon in China "is one | 33 |
| "Martha" or "Louise" | 40 |
| "Lulu" or "Zaza" | 36 |
| "Lulu" or "Wozzeck" | 39 |
| "Lulu" or "Norma" | 37 |
| "Lulu" or "Louise" | 38 |
| "Lulu" or "Lakme" | 37 |
| "Lucrezia Borgia," for one | 36 |
| "L'Africaine," e.g. | 33 |
| "Il Trovatore," for one | 33 |
| "Hänsel und Gretel," e.g. | 38 |
| "Faust" or "Don Giovanni" | 45 |
| "Falstaff" or "Otello" | 42 |
| "Falstaff," for example | 33 |
| "Euridice" was the first complete one | 47 |
| "Ernani" or "Orfeo" | 39 |
| "Don Giovanni", for one | 33 |
| "Die Fledermaus," e.g. | 32 |
| "Der Rosenkavalier," for one | 38 |
| "Deidamia" was Handel's last | 42 |
| "Carmen" or "Tosca" | 39 |
| "Carmen" or "Faust" | 39 |
| "Anna Nicole," for one | 32 |
| "Aïda" or "Carmen" | 41 |
| "A Night at the ___" (Queen album) | 44 |
| 'Tosca' or 'Turandot' | 37 |
| 'Fidelio' or 'Faust' | 36 |
| ''Turandot,'' for one | 37 |
| ''The Magic Flute'', e.g. | 41 |
| ''The Magic Flute,'' e.g. | 41 |
| ''The Barber of Seville,'' e.g. | 47 |
| ''Rigoletto'', for one | 38 |
| ''Porgy and Bess,'' for one | 43 |
| ''Otello'', for one | 35 |
| ''Norma'' for one | 33 |
| ''Nixon in China'', e.g. | 40 |
| ''Fidelio'' is one | 34 |
| ''Fidelio'' for one | 35 |
| ''Fidelio,'' for one | 36 |
| ''Faust,'' for one | 34 |
| ''Ernani,'' e.g. | 32 |
| ''Einstein on the Beach,'' e.g. | 47 |
| ''Carmen,'' e.g. | 32 |
| ''Ada'', for one | 32 |
| In working order, as a vending machine | 38 |
| "The Barber of Seville", e.g. | 39 |
| "Marriage of Figaro", e.g. | 36 |
| Theatergoer's collapsible topper | 36 |
| Target of a mathematical process | 32 |
| Quantity on which a math operation is performed | 47 |
| Mathematical quantity acted upon | 32 |
| "Norma" and "Martha" | 40 |
| "Carmen" and "Norma" | 40 |
| "Norma" and "Don Carlo" | 43 |
| "Falstaff" and "Fidelio" | 44 |
| Vehicles for Moore and McCormack | 32 |
| They're seen at Venice's La Fenice | 42 |
| Met production responsibilities? | 32 |
| Concerns of the Glyndebourne Festival Society | 45 |
| "Wozzeck" and "Jenufa" | 42 |
| "Tosca" and "Turandot" | 42 |
| "Tosca" and "Carmen" | 40 |
| "Rinaldo'' and others | 34 |
| "Norma" and "Don Carlos" | 44 |
| "Norma" and "Carmen," e.g. | 46 |
| "Manon" and "Orfeo" | 39 |
| "Louise" and "Martha" | 41 |
| "Lakmé" and "Lulu" | 41 |
| "Jenufa" and "Tosca" | 40 |
| "Fidelio" and "Falstaff" | 44 |
| "Falstaff" and "Hamlet" | 43 |
| "Ernani" and "Orfeo" | 40 |
| "Doctor Atomic" et al. | 32 |
| "Daphne" and "Euridice" | 43 |
| "Carmen" and" Salome" | 41 |
| "Carmen" and "Otello" | 41 |
| "Carmen" and "Elektra" | 42 |
| "Aïda" and "Carmen" | 42 |
| 'Lakme' and 'Lulu' | 34 |
| Style of Mozart's "Idomeneo" | 42 |
| Old form of Italian musical drama | 33 |
| Many an Alessandro Scarlatti work | 33 |
| Commedia dell'arte alternative | 34 |
| Get under someone's skin, perhaps? | 38 |
| Like music composed for a libretto | 34 |
| Like "Lohengrin," e.g. | 32 |
| One whose working days are numbered? | 36 |
| One whose working days are numbered | 35 |
| Lily Tomlin role in "Laugh-In" | 40 |
| Ernestine, in a Lily Tomlin skit | 32 |
| Antiquated telephone company position | 37 |
| Gilbert & Sullivan production | 33 |
| "The Pirates of Penzance," e.g. | 41 |
| "The Merry Widow," e.g. | 33 |
| "H.M.S. Pinafore," for one | 36 |
| One of Victor Herbert's forty-three | 39 |
| Bernstein's "Candide," for one | 44 |
| "The Student Prince," e.g. | 36 |
| "Student Prince," e.g. | 32 |