an Entity references as follows:
The sixth season of the American reality talent show The Voice premiered on February 24, 2014, on NBC. Carson Daly returned to host. Adam Levine and Blake Shelton returned as coaches for their sixth season, while Shakira and Usher returned for their second (of their two of them) season after being replaced by original coaches Christina Aguilera and CeeLo Green in season five. This was the last season to feature Shakira and Usher as coaches.