I've read a few mixed comments on various fora regarding the quality and appropriateness of Jacob Evancho's singing in the "I See the Light" duet (Songs From the Silver Screen). One notion is that his voice isn't nearly as polished, so pales in comparison to his sister's. Another is that he sounds immature.
My opinion: his voice is technically flawless for what it is; the natural voice of a young male singer with limited training and experience (by the way, this assumes that he has received some training, and does have some experience). He sang completely within his abilities, i.e., he kept it simple.
His voice shows much promise. His strength lies in his forward placement, which is casually referred to as "singing through the face." Good singers achieve resonance by opening up their voice beyond just their throat and nasal cavity. It's easier to feel this while singing than to explain, and it's easier to hear as well. Think of the difference between a nasally singer like, say, Tom Petty (who I like, by the way) and any trained tenor, or even a crooner like Frank Sinatra. Jacob's singing falls between these relative extremes, naturally, but with further training, I think he will be able to improve both the timbre and power behind his singing.
As for his match-up with his sister. Bravo. He was not afraid to stick to basics and let his own voice serve as accompaniment, and she used every bit of her talent, not to outshine her brother, but to help create a dynamic composition. Knowing that their history together includes singing duets, and that by all accounts, they care deeply for one another (side note: geeze, I wish I had grown up in that family), there is a touching element to the performance. But even if I knew nothing about them before hearing the duet for the first time, it would not sound mismatched in my opinion. It was nowhere near as polished and dramatic as her song with The Tenors, but it was nevertheless lovely on its own merits.
Anyway, I didn't see a thread giving this guy some strokes. Feel free to offer your thoughts, and I welcome intelligent criticism. Contrary to what so many emotionally involved fans seem to insist, young performers like Jackie Evancho aren't immune to criticism. We don't need to knock young artists down for no reason, but we don't need to censor constructive criticism either.