Madison VanDenburg, Riley Thompson, Shawn Robinson sparkle on American Idol
Lionel Richie was right about this: American Idol seems to have discovered lots of young talent again in Season 16. Two of the most impressive auditioners Sunday night were 16-year-old females, Riley Thompson and Madison VanDenburg. Madison hails from Cohoes, N.Y., and hit so many glory notes during her audition, Katy Perry was calling her…