Schedule C
https://www.musicalartists.org/contracts-and-agreements/schedule-c/rakes-progress-the/

Rake's Progress, The

Composer:
Igor Stravinsky
Original Language:
English
Librettist:
W.H. Auden and Chester Kallman
Description:
Opera in Three Acts and Epilogue
Notes:

Text after Hogarth

Time:
18th Century
Place:
England
Role Voice Part Classification
Tom Rakewell Tenor L
Ann Trulove Soprano L
Nick Shadow Bass-Baritone L
Baba the Turk Mezzo Soprano L
Trulove Bass F
Mother Goose Mezzo Soprano F
Sellem Tenor S
Keeper of the Madhouse Bass B
Solo Voice Bass CB
Bidders* Spoken CB*
* The bidders are notated in the score as shouts in specified rhythms. The score does not state which voice category should be heard nor does it specify the number of bidders. Should any individual chorister shout a bid in the scene, then that chorister's shout is to be classified as a Chorus Bit role.
 
Minimum Chorus:  18