On the night Cassadee Pope was crowned champion of season three, Christina Aguilera and Cee Lo green took the stage with fellow mentors Blake Shelton and Adam Levine to sing their goodbyes with a performance of Green Day's song, "Good Riddance (Time of Your Life)."
NBC announced Monday that Aguilera and Green would not be involved in the fourth season of the singing competition show, and would be replaced by Usher and Shakira.
Tuesday's episode included the first promo featuring the new mentors along with the old, fighting over the car radio and rocking out to "Total Eclipse of the Heart".
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