If you haven't seen these, as they are making the rounds on YouTube currently, then please take the time to watch these. Like Remy in "Ratatouille," to paraphrase Chef Gusteau, not everyone can sing, but a great singer can come from anywhere.
Susan Boyle sings "I Dreamed a Dream" from "Les Miserables"
Peter Potts sings "Nessen Dorma" from "Turandot"
I don't know about you, but I got chills listening to both of these stunning unknowns sing stunning versions of these beatiful songs. I know you will enjoy it as much as I do.