| Clue | Source | Date |
|---|---|---|
| Faust and Méphistophélès, for two | The New Yorker | 08 Apr 2019 |
| Macbeth and Otello | The Washington Post | 19 Jan 2019 |
| Macbeth and Otello | LA Times Daily | 19 Jan 2019 |
| Macbeth and Otello | ||
| Aida and Norma, notably | ||
| Faust and Méphistophélès, e.g. | ||
| Tristan and Isolde, e.g. |