Ledaero, that was fascinating, thank you!
Voice type has also been characterized into role type, to a certain extent. Ingenue-Soprano, Young Male Lead-Tenor, Mother/Older Woman-Alto, Father/Villain-Bass, with contraltos and baritones spread among the categories. I'm not saying it's always like this or that it's quite this simple, but that's a fair characterization of many of the classic musicals in terms of voice casting. A bass voice in a lead role is typically something like Tevye in Fidder or Tony in The Most Happy Fella. With altos or contraltos I think it's been different because many of the great female stars have had deeper voices, i.e., Merman, Channing, Lansbury, Rivera.
Videos