| 100% | LULU | 4 | Opera based on two Wedekind plays |
| 56% | BARBEROFSEVILLE | 15 | Opera based on a play by Pierre Beaumarchais, with "The" |
| 56% | VERDI | 5 | He wrote several operas based on Shakespeare plays |
| 56% | RIGOLETTO | 9 | Verdi's opera based on a Victor Hugo play |
| 56% | ERNANI | 6 | 1844 Verdi opera based on a Victor Hugo play |
| 54% | OTELLO | 6 | Verdi opera based on a Shakespeare play |
| 54% | OTELLO | 6 | Verdi opera based on a Shakespearean play |
| 49% | LATOSCA | 7 | 1887 play on which a 1900 opera is based |
| 45% | OTELLO | 6 | Verdi opera based on Shakespeare |
| 45% | ELEKTRA | 7 | Strauss opera based on Sophocles |
| 45% | ATALANTA | 8 | Handel opera based on Greek myth |
| 45% | ARIANE | 6 | Massenet opera based on Greek myth |
| 44% | LESTROYENS | 10 | Berlioz opera based on Virgil's "Aeneid" |
| 44% | SAPHO | 5 | Massenet opera based on a Daudet novel |
| 44% | ARIANE | 6 | 1906 Massenet opera based on Greek myth |
| 44% | TROYENS | 7 | "Les ___" (Berlioz opera based on the "Aeneid") |
| 44% | ATTILA | 6 | Verdi opera based on a historic invader |
| 44% | OTELLO | 6 | Verdi opera based on a Shakespeare tragedy |
| 44% | ELEKTRA | 7 | Strauss opera based on a Sophocles tragedy |
| 44% | CANNERYROW | 10 | Nolte movie based on two Steinbeck novels |
| 43% | WERTHER | 7 | Massenet opera based on a work of Goethe |
| 43% | ADO | 3 | "Much ___ About Nothing," 1901 opera based on the Shakespeare play |
| 43% | RIENZI | 6 | Wagner opera based on a 14th-century Italian patriot |
| 42% | AIDA | 4 | Musical based on an opera |
| 42% | AIDA | 4 | Musical based on a Verdi opera |
| 41% | ARPEGGIO | 8 | Broken chord, based on harp playing |
| 41% | TRASHIER | 8 | Playing on baser instincts |
| 41% | PHANTOM | 7 | "__ of the Opera" play based on the French novel |
| 41% | AIDA | 4 | Elton John musical based on an opera |