FILE - In this combination photo, Jason Derulo, left, and Demi Lovato appear at the iHeartRadio Music Awards on March 5, 2017, in Inglewood, Calif. YouTube is launching a new music competition series for emerging artists featuring Derulo, Lovato and The Backstreet Boys. Ryan Seacrest Productions and Endemol Shine North America announced Wednesday that “Best.Cover.Ever” will debut on YouTube later this year. (Photos by Jordan Strauss/Invision/AP, File)