| Term | Definition |
|---|---|
| Mikado, The | The Mikado (UK, 1885) Comic opera in three acts by WS Gilbert; music by Arthur Sullivan |
| Merry Widow, The | The Merry Widow (UK, 1907) Comic opera in three acts by Basil Hood, adapted from the German of Victor Leon & Leo Stein; lyrics by Adrian Ross; music by Franz Lehár |
| Maritana | Maritana (UK, 1845) Opera in three acts by Edward Fitzball; music by Vincent Wallace |
| Madame Sans Gene | Madame Sans Gene (UK, 1897) Comedy in a prologue and three acts by J Comyns Carr, adapted from the French of Victorien Sardou & E Moreau |