Mark Ronson's obsession with retro soul warmth—and experience as the hippest of DJs in both NYC and London—shows in his expansive pop hits. His rousing "Uptown Funk" with Bruno Mars kicks with '70s electro-funk swagger. Ronson channels the moody horns and driving drums of '60s girl groups for Amy Winehouse and Christina Aguilera, and he takes rappers Wale and J-Live back to the golden era of hip-hop.