Blake Shelton, Christina Aguilera, Adam Levine, and CeeLo Green kicked the show off with an epic collab.

When The Voice burst onto the scene in 2011, OG Coaches Adam Levine, Christina Aguilera, Blake Shelton, and CeeLo Green joined forces for a rendition of Green’s hit ”Crazy” (when he was in the duo known as Gnarls Barkley).

During their cover, Levine handled the introduction lyrics while the other Coaches hummed backup vocals. The crowd then went wild when Shelton started singing and Levine kicked in with the drums. Naturally, X-Tina riffed away while Shelton played his guitar with confidence.

Listen to the captivating cover here.

What to know about ”Crazy” by Gnarls Barkley
Released in 2006 by Cee Lo Green and producer Danger Mouse as Gnarls Barkley, ”Crazy” reached the number-two position on the Billboard U.S. Hot 100 chart. The song was critically acclaimed, winning a Grammy Award in 2007.

In 2021, Rolling Stone ranked it 307 on its ”500 Greatest Songs of All Time” list. Ten years earlier, the outlet named it as the best song of the 2000s, describing the tune as ”the most glorious pop thrill of our time.”

”Crazy” has also been covered by Prince, Nelly Furtado, Violent Femmes, Ray LaMontagne, Paris Hilton, Cat Power, The Raconteurs, Billy Idol, One Republic, The Neighbourhood, Kacey Musgraves, and more.

CeeLo Green, Adam Levine, Christina Aguilera, and Blake Shelton appear pose for a photo during the Season 5 finale of The Voice Photo: Trae Patton/NBC

”Crazy” by Gnarls Barkley lyrics
I remember when
I remember, I remember when I lost my mind
There was something so pleasant about that place
Even your emotions have an echo in so much space

And when you’re out there without care
Yeah, I was out of touch
But it wasn’t because I didn’t know enough
I just knew too much

Does that make me crazy?

And I hope that you are having the time of your life
But think twice, that’s my only advice
Come on now, who do you, who do you, who do you
Who do you think you are
Ha ha ha, bless your soul
You really think you’re in control

I think you’re crazy
I think you’re crazy
I think you’re crazy
Just like me

My heroes had the heart to lose their lives out on the limb
And all I remember is thinking I want to be like them

Ever since I was little
Ever since I was little it looked like fun
And it’s no coincidence I’ve come
And I can die when I’m done

But maybe I’m crazy
Maybe you’re crazy
Maybe we’re crazy
Probably