Transport Group concerts are unique in that they don't assign the roles. It's a fabulous roster of performers doing all the numbers. For instance, when they produced The Music Man a while back, there were at least three different women taking turns with Marian's songs.
I don't know if I like that way. I think they should assign roles. However if someone sucks bung in they're role at least we won't be stuck with them for the entire show. I approve.