Mac Miller donated 50k to the Make A Wish Foundation back in December, and at that time he met a young cancer patient named Bobby Stewart.

Mac fulfilled cancer-stricken teen's dream by asking Stewart to record a track with him. Stewart joined Mac, along with producer I.D. Labs, in the studio to record a joint together. 

Bobby spoke on the experience, "To be with Mac is a blessing. He’s lyrically amazing. Hip hop is my passion. So to be able to be with Mac Miller, who’s a Pittsburgh legend... Wiz Khalifa shoutout."

Mac added in a statement, "Feeling like your music really does something for the world makes it all worth it, no matter what. From now on, no matter what happens for the rest of my life, no one can take that away from me."