Few songs achieve the iconic status of "Uptown Funk." Learn how Mark Ronson and Bruno Mars channeled 80s funk, navigated intense recording sessions, and battled legal disputes to craft a global hit.

Back in 2014, the “Leave the Door Open” artist, 38, teamed up with DJ and producer Mark Ronson for their epic “Uptown Funk” smash off the latter’s Uptown Special album. In their ...