Usher’s half-time performance during this year’s Super Bowl between the Kansas City Chiefs and San Francisco 49ers has come under fire from thousands across the globe. As the players took a well-deserved break in the Allegiant Stadium locker rooms, Usher took to the field to belt out a long list of his best-known hits. The singer began with Caught Up before he reeled off a few more of his solo hits. As the half-time show progressed, Usher was joined by several other famous faces and collaborators from years gone by. Alicia Keys prompted raucous applause from the crowd when she was unveiled as …