Moravia is interesting in comparison to Bohemia in that it has a wide variety of dialects, while "Prago-centric" Bohemia has absolutely none at all.

There are 5 actively spoken dialects in Moravia, separated by region, and many many sub-dialects and variations. That said, all dialect speakers can speak normal Czech as well, and often switch between dialect and Czech, depending on the situation.

In terms of producing a Czech opera with non-native speakers, Czech language coach is hired who is present at every rehearsal and coaching. It is a grueling process, as the pronounciation is very difficult.