Look up "Eminem 2013" on Youtube, and you will find a FUCK-TON of fake songs, that are usually from Denace or what-the-fuck his name is. The thing is, some people fall for this bullshit. You could usually find comments like "omg this is so beast em" on about every song.
As for the people who actually make them, they never sound good. I found one video that claims to be a new song by Eminem, featuring Lil Wayne and HAILIE. You know what it actually was? A remix, with a shitty Taylor Swift song.
Stupid tweens.