| Verfasser | Häufigkeit |
| Covin, Jeffrey G. |
2 |
| Deutsche Oper Berlin Chor |
2 |
| Deutsche Oper Berlin Orchester |
2 |
| Grant, Sebastienne |
2 |
| Jekal, Philipp 1992- |
2 |
| Klaren, Georg C. 1900-1962 |
2 |
| Kuratko, Donald F. |
2 |
| Magee, Emily 1965- |
2 |
| McDonald, Sakenya |
2 |
| Mehnert, Mick Morris 1996- |
2 |
| Morris, Bethany |
2 |
| Morris, James 1947- |
2 |
| Morris, Michael H. 1953- |
2 |
| O'Gwin, Chase Kelly |
2 |
| Philip, David Butt 1980- |
2 |
| Runnicles, Donald 1954- |
2 |
| Schönberg, Arnold 1874-1951 |
2 |
| Tacheron, Donald G. |
2 |
| Tsallagova, Elena |
2 |
| Udall, Morris K. |
2 |