VIDEO : Lady Gaga Joins Elton John Onstage to Sing ?Don?t Let the Sun Go Down on Me?

The Rocket Man was joined onstage by Mother Monster. Elton John took the streets of West Hollywood, Calif. on Saturday (Feb. 27, 2016) with a surprise concert with none other than Lady Gaga. Aside from performing a selection of his huge catalog of hits for those in and around the parking lot of the former Tower Records, one of the biggest highlights came when Lady Gaga joined him to perform 1974 hit ?Don?t Let the Sun Go Down on Me.? ?Give it up for this wonderful man who?s inspired people for generations,? Gaga said while taking the stage.