I'm unfamiliar with the stage score, but I'd assume a studio recording would be pointless since it was remade into a TV musical in the late '90s starring Whitney Houston, Brandi, Bernadette Peters, et al. and a soundtrack was released from that film. I can only see a studio recording being made only IF this film hacked up the score.
The original Julie Andrews telecast is preserved on DVD, too.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle