The megawatt stars of music will light up Las Vegas when the Billboard Music Awards touch down at the MGM Grand Garden Arena, airing live at 8 p.m. ET on May 19 on ABC. Heavy-hitters Taylor Swift, fun. and Maroon 5 lead the pack: Each act is up for 11 awards (based on album and digital sales, touring, streaming and interactions with social media and other online music destinations). "30 Rock" funny man Tracy Morgan will host the evening, executive-produced by Don Mischer, with confirmed performances by Swift, Justin Bieber, Miguel and Bruno Mars. Additional buzz?