The NFL 'immediately' sent a letter of apology to Lil Wayne after announcing last year that Kendrick Lamar had been chosen to perform the Super Bowl halftime show. Lil Wayne was denied the chance to headline this year's halftime show in New Orleans, a move which sparked outrage given his famous association with the Big Easy - where he was born and raised. And to add to the controversy, Kendrick's performance at the Superdome was heavily criticized by viewers who were left underwhelmed on Sunday night. The Not Like Us rapper, who included his famous diss track about bitter rival...