In all seriousness though, when Mars took the stage with crowd pleaser "Uptown Funk," the show got interesting. Beyonce emerged from the sideline, leading her dancers through "Formation" before joinin. Before any more awards were revealed, Audra Day and Ellie Goulding performed a duet mashup of. blues singer King passed away in May. After Beyoncé announced Mark Ronson and Bruno Mars won record of. The Singing Stone Book 2 My…