The producer says there was a moment when his co-writers thought, "Maybe this song wasn't meant to be." He also describes working with Amy... The Story Behind Mark Ronson's Hit Song 'Uptown Funk' When ...

"Uptown Funk" is featured on Mark Ronson's album "Uptown Special," but the lead vocal is by Bruno Mars, who co-wrote the song. (SOUNDBITE OF ARCHIVED BROADCAST) GROSS: Ronson is a musician, producer ...