He's the one who understands the fickle crowds who worship Eva. Snow's big voice made a mike seem superluous. Snow's singing compensated for the fact that, as Per n, he is given little to do on stage except walk around and look important. He has a strong voice, not a must for the part but a pleasant bonus for such numbers as I'd Be Surprisingly Good For You. He is also a good actor, especially evident in his underplaying scenes with Eva, who must be the dominant figure.
Snow is no stranger to the role of Per n.
A year ago he was a last minute replacement for the Per n role in a production in the Poconos.