Wondering what Beyonce's 'mommy voice' sounds like?

Beyonce sings to her daughter in a "mommy voice".

The 31-year-old pop superstar - who is currently on her 'Mrs. Carter Show World Tour' - doesn't use her full range of vocal talents when she sings nursery rhymes to 16-month-old Blue Ivy and save's her "Beyonce voice" for the stage.