Pop singer David Archuleta (American Idol) and stand-up comic Sherry Cola (Good Trouble) headline this Mongolian story about the origins of the country's national instrument: the horsehead fiddle. Voices in this episode include Doug Lockwood, Maurice Emmanuel Parent, Kimberly Schraf, David Archuleta and Sherry Cola. Grown-ups, look for stand-up comedian Sherry Cola on the Freeform network drama, Good Trouble. Singer-songwriter and American Idol star David Archuleta kicks off his Ok, All Right...more