Toby Spence has more to say about Alex in a preview in the Independent:
"In this production the actor Alex Jennings will play Pangloss. Can he sing? "Yes – he did My Fair Lady – but when you ask me a question like that, I have to ask you, what is singing?" OK, what is singing? "It's projecting words through music. Which is why actors often make fantastic singers." But has he a voice? "It's quite annoying – he can't read music, but he sings on pitch, and he's got a good ear. He's a really good Pangloss.""