Mars co-wrote the track with the British mega-star for her third album, 25. With his XXIV cap, gold chains and Hooligans band, Mars gave "All I Ask" a sparkling rendition, hoisting everything he had to his vocals.
"We were aiming for that big, diva, ballad thing—that's what I envisioned," Mars said about the track. He also said that they argued over word choice with the line, "Take me by the hand while we do what lovers do." He went on:
"'Lovers'? I don't know if anybody really says 'lovers.' 'Yeah, we're lovers.' 'This is my lover.' I was like, 'Should we rethink that?' But [Adele] was so gangster about it. She was like, 'Nope. That's what it has to be.' And she was right.
"It's this grand word that makes the song bigger because no one says it. Because nobody talks like that, it pops out. It's not 'what boyfriends-and-girlfriends do' – it's this over-the-top 'lovers.' Sometimes I play it on the piano, and I look forward to singing that part. It's fucking perfect ... Don't try to be cool. Let it be what it wants to be."
Mars is getting ready to drop his own album, 24K Magic, on Nov. 18. He also performed the lead single on Live Lounge:
Watch a Fuse throwback interview with Mars: