Jackie Evancho is my current favourite, she can do no wrong, but as Equipoise has attested, Happy Rhodes is unbelievable with her extreme range.
Sissel Kyrkebo is quite amazing except for her choice of a lot of her material, as with Hayley Westenra. I’m grateful to them though for indirectly leading me to Jackie Evancho.
Love this by Hayley and Russell Watson - Pokareke Ana.
Then there is Inva Mula who sang the part of the Diva Plavalaguna in “The 5th ELement”
Also an absolute delight is Ana Netrebko, here singing Solveig’s Song from Per Gynt.
And with her friend Elina Garanco singing the Flower Duet from Lakmé.
They do an amazing Barcarolle too.
Elina Garanca is a force to be reckoned with on her own, for example here with Habanera.
As has been mentioned it isn’t necessary to have the proportions of an hippopotamus to be able to sing well and these ladies all underscore that fact. Elina looks like someone you wouldn’t want to tangle with though. A very icy beauty about her.
The star of them all is Jackie though. Astounding at ten years old she seems to be improving day by day and who knows what the future may bring, she seems capable of almost anything and multi-talented with it.
A couple of examples:
With David Foster in Las Vegas.
Nessun Dorma. If that doesn’t reduce you to tears then your heart is made of stone.
She can do pop too: Brige Over Troubled Water!
Angel. She certainly is!
Lovers.
Dark Waltz, written for Hayley westenra I believe but IMO Jackie excels.
National Anthem
Whatever she does she immerses herself in it completely.
There are so many more fine examples and I have emulated Equipoise in the link overload. Can’t have too much Evancho though.
Here is a recent thing that is completely different but shows what an unspoiled girl she is.
You’ll Miss Me 