Actors create characters that are appropriate for the selected pieces, playing a variety of ages and types; with actors reading every age, old and young, and every type. But, as in any good show, the characters must be done well! The single requirement is to make the piece work, whether it's by Dickens or George Washington. The poem or story or recipe - there's a wonderful recipe for Fruitcake which is never finished because the "chef" finally passes out - must be well played.
Singers can number two to six or more. Whatever works for your
situation. The music, should be chosen for your singers, their
experience and training, from classical choral pieces to traditional
carols, solos, duets, blues, spirituals; what is best for you and your
"Consort" or soloist.