Two people have mentioned Kiri Te Kanawa, so I'll add my two cents. She did an album of folk songs which I found unlistenable - those poor songs were helpless against the onslaught of that voice. Then I listened to her doing South Pacific and expected the same, but was pleasantly surprised; she was singing it as Broadway musical, not as grand opera, and it sounded great. Maybe if I had the benefit of the broadcast Will Fly refers to, I'd agree that Mary Martin did it better, but I thought KTK did it very well.