While surfing the net, I stumbled across the music of Sierra Hull. Like Alison Krauss, she was a child prodigy in bluegrass music. Her instrument of choice is the mandolin, rather than Alison's fiddle. She also sings quite beautifully, IMO. Here are a few samples for those who may (or may not) be fans of bluegrass and/or beautiful female vocals.

"Daybreak" http://www.youtube.com/watch?v=hY_Lfm75P2c

"Someone Like You" (cover of Adele)  http://www.youtube.com/watch?v=gtlERQTFgL4

"Tell Me Tomorrow" http://www.youtube.com/watch?v=I8dwq0NXwlc&feature=related

Chasin' Skies" (instrumental) http://www.youtube.com/watch?v=-2ihs2PPf8s&feature=related