Besides the protagonist, represented by a dummy, there are 23 roles requiring seven singers (mezzo-soprano, countertenor, bass, 2 tenors, 2 baritones) and 4 dancers.
en.wikipedia.org She was a soubrette, mezzo-soprano and comedienne who had worked in the theatre since her late teens.
en.wikipedia.org Her voice had a rich, true mezzo-soprano quality with a brilliant top, and dark reedy chest tones.
en.wikipedia.org They tease, ponder, reminisce, philosophize and invent parables, and she sings them in a plush, changeable mezzo-soprano that usually holds a kindly twinkle.
en.wikipedia.org This version included a choir and vocal parts for soprano and mezzo-soprano.
en.wikipedia.org