Bruno Mars And Esperanza Spalding Are “Old & Crazy”: Hear The Cheeky Bonus Track

Bruno Mars teams up with singer Esperanza Spalding (or, That Random Person Who Beat Justin Bieber For 2011’s Best New Artist Grammy) on his Unorthodox Jukebox Target bonus track “Old & Crazy.” It’s a playful jaunt that finds Mars really going retro — as in, saloon piano and jazz-era horns. In the vein of Lianne La Havas‘ “Age,” the two singers trade verses about love’s ability to triumph over decrepitude, asking, “Will you still call me ‘baby’ when I’m old and crazy?” Hear the simple duet after the jump.

[via ONTD]

What do you think of the retro duet? Let us know in the comments, or on Facebook and Twitter.