WWE: MGK to Perform at WrestleManiaBy Cassidy| March 13, 2012 Wrestling News WWE.com has revealed that, after last night’s RAW went off the air, John Cena invited rap superstar Machine Gun Kelly (MGK) into the ring to reveal that MGK will be performing Cena’s entrance theme on April 1 in Miami at WrestleMania. MGK (along with Ester Dean) provided one of the three WrestleMania themes, “Invincible”. What do you think of Machine Gun Kelly performing Cena’s entrance theme at WrestleMania? Post your comments in the box below.