PAIA, Hawaii (AP) - An ukulele player at a Hawaii coffee shop sang the duet of a lifetime with reggae artist Matisyahu, all the while completely oblivious to his famous singing partner's identity.

The ukulele—once a unique instrument from Hawaii, is now one of the hottest instruments in music. Now you can hear for yourself the magic of the ukulele. You’ll hear everything from the ukulele, ...