Schedule C
https://www.musicalartists.org/contracts-and-agreements/schedule-c/mourning-becomes-electra-revised-version/

Mourning Becomes Electra [revised version]

Composer:
Marvin David Levy
Original Language:
English
Librettist:
Henry W. Butler
Description:
Opera in Two Acts [revised version]
Notes:

after the play by Eugene O’Neill

* A revised version was first produced by the Seattle Opera in 2003. Further revisions were made for a 2004 production by New York City Opera. This classification reflects those revisions.

Time:
Spring and Summer of the years 1865 and 1866
Place:
New England
Role Voice Part Classification
Christine Mannon Soprano L
Lavinia Mannon Soprano L
Orin Mannon High Baritone or Dramatic Tenor** L
Captain Adam Brant Baritone F
Helen Niles Soprano S
Peter Niles Baritone S
General Ezra Mannon Bass S
Jed Bass B
** The revised score states that either voice category can sing this role.
 
Minimum Chorus:  No chorus