Stevie Wonder wows crowd on 'smart' piano at tech show

Trying to distinguish your product among the thousands at the CES gadget show is no easy feat, so it helps when music legend Stevie Wonder pays an unexpected visit.Especially when your product is a 'smart' piano designed to teach people how to play.Piano teacher Gabie Perry was demonstrating the internet-connected device, made by a California startup, when someone told her that Wonder asked to try it.  Stevie Wonder plays a so-called 'smart' piano, an internet-connected device designed to ...