[left that other site]

Isn’t “Porgy and Bess” restricted to Black Singers Only, at the insistence of George Gershwin himself?

Just askin’.

[elcid1970]

Or try producing Scott Joplin’s post-slavery opera “Treemonisha” with an all-white cast.

[x]

Ira Gershwin, George's brother and heir (who also co-wrote the libretto), barred all-white productions in apartheid South Africa, but the opera was performed by white casts in blackface in Europe in the Forties. White singers, most notably Mel Torme, have also recorded songs from the opera.

Eventually, they'll get around to using "non-traditional" casting in "Who's Afraid of Virginia Woolf." It does require a little rewriting and it will be a while before the estate will allow that.