"Because her voice is, it's like the muscles and it develops all the time. That was the fantastic thing for us"

In this quote, Andrew Lloyd Webber is referring to the voice of a vocalist. He is stating that the singer's voice resembles a muscle, because it develops with time. This is a great thing for the listener, as the vocalist's voice will become more effective and gorgeous as they continue to practice and refine their craft. The vocalist's voice will become more expressive and emotive, permitting them to convey the emotion of a tune better. This is a terrific thing for the audience, as they will have the ability to experience the tune in a more meaningful way. The vocalist's voice will likewise become more versatile, enabling them to check out different categories and styles of music. This is a great thing for the artist, as they will have the ability to express themselves in a range of ways. All in all, Andrew Lloyd Webber is praising the vocalist's voice for its capability to establish and grow gradually.