Mac Miller has joined forces with aspiring rapper Bobby Stewart, who is battling cancer, to help him get the hang of things.

With Miller's help, the hip-hop newcomer, who suffers from T-cell lymphoma, has created music talking about his struggle. "It's cool what I did, but the story here is him; the story is that there's a kid that's battling one of the gruesomest, toughest diseases in the world, yet he's courageous enough to talk about it in his music," said Mac to MTV News. "This is someone who really talks about his sh-- in his music, like all the stages of cancer, to the point where it's uncomfortable for some to listen to because it's that much real, it's too real, it's that painful."

And while the Pittsburgh rapper has helped Stewart along the way, he hasn't rapped on his tracks as of yet. "I just wanted to do what I could do to mentor him and help him put a song together and give him what I know,"said Miller. "I didn't want to step in on the song because to be real, he did a whole song about cancer, and then what am I gonna come in with on the third verse?"

Stewart, also known as Yung Ka, first met Miller at his Pittsburgh concert in December where he presented the Make a Wish Foundation with $50,000. "To be with Mac is a blessing," said Yung Ka. "His lyrics are amazing. Hip-hop is my passion. To be able to be with Mac Miller ... he is a Pittsburgh legend. Wiz Khalifa shout-out."