Diddy and Dr. Dre Hit Studio for 1st Time Ever |

ULTIMATE COLLAB

Diddy's "R&B is Dead" campaign has led the Bad Boy Records founder back into the studio ... with the legendary Dr. Dre marking their first-ever musical meetup!

Sources familiar with the session tell TMZ Hip Hop Dre was actually coaching Diddy on how to say certain words and made sure they had it right.

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We're told the track will likely end up on Dre's upcoming album with Snoop Dogg (who was also in the building) which the West Coast rap legends have been teasing since February's Super Bowl performance.

Jimmy Iovine, Tank, Pheelz, LVRN's Justice Baiden and others were also in the mix to keep the energy high and ideas flowing.

Seeing as it was their first time recording together, the 2 super-producers were trying to get a feel for each other's chemistry. We’re told the song felt like it was coming together nicely, and Diddy and Dre definitely “clicked” and had fun.

Diddy celebrated the moment with a post calling it a “dream come true,” and labeling Dre a "superhero."

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While there are no timetables on when the albums will be finished, Snoop is planning to finally return all the Death Row albums back to streaming services within a month's time ... so don't be surprised if we have new music by then!