| Role | Voice Part | Classification |
|---|---|---|
| Clytemnestra | Mezzo-Soprano | L |
| Orestes | Tenor | L |
| Elektra | Soprano | F |
| Cassandra | Soprano | F |
| Aegisthus | Baritone | F |
| Agamemnon | Bass | F |
| Pallas Athena | Soprano | S |
| Apollo Loxias | Baritone | S |
| Guard | Bass | S |
| Slave | Bass | B |
| Coryphée | Bass | B |
| Aréopagite | Bass | B |
| Minimum Chorus: 48 | ||
| Divisi: SATB |