Mark Ronson wrote a letter to get Stevie Wonder to appear on his new album.
The 39-year-old producer is a long-time fan of the music legend and has revealed the unusual steps he took in order to get Stevie, 64, to feature on his album, 'Uptown Special'.
He told the Daily Mirror newspaper: "I wrote his manager a letter. I had written that melody and was singing it in my head, and it had a harmonica sound - and I just thought, 'What the hell.'
"I didn't hear anything for a couple of months - then I suddenly got a message from his manager saying, 'Yes.'
"I've spent most of my adult life listening to his music - he's my favourite musician and singer-songwriter of all time - so it was heavy."
The pair collaborated on the songs 'Uptown's First Finale' and 'Crack in the Pearl, Pt. II', and Mark recently revealed he gets "messed up" when he thinks about working with the 'Superstition' star.
He shared: "I still can't believe somewhere in a studio in Chicago one night, Stevie Wonder actually recorded a piece of music that I wrote. I've listened to it a hundred times and it still messes me up when I play it."