| Verfasser | Häufigkeit |
| Brembeck, Helene 1952- |
2 |
| DeShong, Elizabeth |
2 |
| Donizetti, Gaetano 1797-1848 |
2 |
| Everts, Jonathan |
2 |
| Fabiano, Michael 1984- |
2 |
| Fleming, Renée 1959- |
2 |
| Frizza, Riccardo 1971- |
2 |
| Fuentes, Maria |
2 |
| Halkier, Bente |
2 |
| Hertz, Frej Daniel |
2 |
| Jackson, Christopher |
2 |
| Jackson, Peter 1955- |
2 |
| Jagde, Brian |
2 |
| Kness, Austin |
2 |
| Kowaljow, Vitalij 1968- |
2 |
| Kuster, Ryan |
2 |
| Li, Ao 1988- |
2 |
| Meah, Angela |
2 |
| Montenegro, Daniel |
2 |
| Robertson, Ian |
2 |