Music industry royalty has come together to sing in honour of the 49 victims of the Pulse Nightclub shooting in Orlando, Florida on June 12, 2016 Jennifer Lopez, Gwen Stefani, Jason Derulo, Meghan Trainor, Juanes, P!nk, Mary J. Blige, Selena Gomez and Britney Spears are among 24 artists featured on a new recording to raise money for victims of the Pulse nightclub massacre