| Answer | Crossword Clue |
|---|---|
| PRINCEIGOR | Borodin's unfinished opera |
| IGOR | Borodin's unfinished opera, "Prince ...." |
| IGOR | Borodin's unfinished "Prince ..." |
| LULU | Unfinished Berg opera |
| LULU | Berg's unfinished opera |
| IGOR | Hero of an unfinished opera. |
| OCA | "L'... del Cairo" (unfinished Mozart opera) |
