To celebrate today's Business Casual release, Chromeo have leaked a duet with Ezra Koenig called "I Could Be Wrong" that didn't make the album. The song is pretty fun; Koenig sounds like he's having a blast getting to play the loverman role. And how could you not have fun on a song with a seriously cheesy sax solo? And then there's a spoken word discussion in there too. Best New Fun Song, here, basically. Go to Pitchfork to hear it.