Well-respected music producer Quincy Jones joins the long list of people wondering why rapper Sean Combs is still relevant musically.

“P. Diddy wouldn’t know a B-flat” if it hit him in the face, said Jones to singer Bruno Mars at an event to launch a new music app on Tuesday. “P. Diddy has a doctorate in marketing. He’s got clothes companies and Ciroc vodka,” said Jones after telling the audience to “learn your craft.”

Most so-called “producers” actually depend on real producers who create the music but see the credit go to the bigger name producer, such as Sean Combs.

Case in point: An unknown Stevie J languished behind the mixing boards in the studio crafting music for Puff Daddy, who then took all the credit in the 1990s.

Other producers who took credit for other people’s work include Dallas Austin and Jermaine Durpri. Which explains why they can’t buy a hit today.

Photos: Stefan Jeremiah/WENN.com

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