Fernström did himself assign opus numbers 1-99. He also created several compositions without assigning any opus numbers. These have here been given numbers above 1000.
| Opus | Hidden | Title | Instruments | Duration | |
|---|---|---|---|---|---|
| -- | 9999 | Corporal Tin Soldier | Show | ||
| -- | 9999 | The Taming of a Schrew | Show | ||
| -- | 9999 | The actors enter | Show | ||
| 25a | 25 | Echnaton | Soli, SATB, womens choir, orchestra | Show | |
| 58a | 58 | The Wedding of the Isis' Sisters | Soli, chorus, orch. | Show | |
| 70a | 70 | Supplementary music to A Midsummernight's Dream | Show | ||
| 71a | 71 | Around the World in 80 Days | soli,chorus, orchestra | Show | |
| 75 | 75 | Enchanted glasses | Show | ||
| 82b | 82 | Niels Ebbesen | solo, chorus, 3 vl, va | Show | |
| 82c | 82 | Hamlet | ob, cl, 2tr, 2trb, tu, 2perc | Show | |
| 83 | 83 | La vida es un sueno | Show | ||
| 86a | 86 | The Merchant in Venice | Show | ||
| 87a | 87 | Ni-Si-Pleng | Show |