| 100% | ATTILA | 6 | Verdi opera based on a historic invader |
| 68% | OTELLO | 6 | Verdi opera based on a Shakespeare play |
| 68% | OTELLO | 6 | Verdi opera based on a Shakespeare tragedy |
| 68% | OTELLO | 6 | Verdi opera based on a Shakespearean play |
| 65% | ERNANI | 6 | 1844 Verdi opera based on a Victor Hugo play |
| 61% | AIDA | 4 | Musical based on a Verdi opera |
| 60% | AIDA | 4 | Elton John musical based on a Verdi opera |
| 59% | RIGOLETTO | 9 | Verdi's opera based on a Victor Hugo play |
| 59% | AIDA | 4 | Elton John Broadway musical based on a Verdi opera |
| 59% | AIDA | 4 | Elton John/Tim Rice musical based on a Verdi opera |
| 55% | OTELLO | 6 | Verdi opera based on Shakespeare |
| 52% | SAPHO | 5 | Massenet opera based on a Daudet novel |
| 52% | ELEKTRA | 7 | Strauss opera based on a Sophocles tragedy |
| 52% | BARBEROFSEVILLE | 15 | Opera based on a play by Pierre Beaumarchais, with "The" |
| 52% | WERTHER | 7 | Massenet opera based on a work of Goethe |
| 51% | RIENZI | 6 | Wagner opera based on a 14th-century Italian patriot |
| 48% | ATTILA | 6 | Historical figure on whom a Verdi opera is based |
| 48% | AIDA | 4 | Elton John musical based on a work by Verdi |
| 44% | THEAERONAUTS | 12 | 2019 adventure film based on a true story about a historic gas balloon flight (2 wds.) |
| 43% | THEPHANTOMOF | 12 | Musical based on a French novel, "___ the Opera" is the longest-running show on Broadway: 3 wds. |
| 42% | LATOSCA | 7 | 1887 play on which a 1900 opera is based |
| 42% | LATOSCA | 7 | 1887 drama on which a Puccini opera is based |
| 41% | TRUE | 4 | Based on a ___ story |
| 41% | MADAMEBUTTERFLY | 15 | Cho-Cho-San story on which a Puccini opera was based |
| 41% | TRUE | 4 | Based on a ___ story; factual |
| 40% | LULU | 4 | Opera based on two Wedekind plays |
| 40% | BOHEME | 6 | "Scènes de la Vie de ___" (novel on which a Puccini opera is based) |
| 39% | ELEKTRA | 7 | Strauss opera based on Sophocles |
| 39% | ESTD | 4 | Abbr. on a historic building |