Music EXCLUSIVE: The Making of PJ Morton's 'Only One' By Antoinette Bueno 10:36 AM PDT, April 5, 2013 PJ Morton, the keyboardist for Maroon 5, is ready to go solo with his album New Orleans, and only ET has the exclusive behind-the-scenes footage of the making of his first video for Only One! Only One features Stevie Wonder on harmonica, and the accompanying music video perfectly complements the soulful tone with its old-school, Mad Men vibe. Video: Adam Levine -- I'll Never Leave Maroon 5 "The concept of the video is the concept PJ really wanted," says director Jeffrey Elmont. "It's that '70s/'60s kind of feel from Mad Men, so -- very slick, very sophisticated, very cozy and intimate."Clearly, PJ more than pulls off the dapper look, and as you can see from watching the video, has a whole lot of fun with it too!Video: Maroon 5 Reflects on 10 Years of FameNew Orleans, featuring special guests Wonder, Busta Rhymes, and a track with Adam Levine, is out May 14, 2013 via Lil Wayne's Young Money Entertainment.