Okay I made a remix of Eminem and Linkin Park so I don't own the original songs. Here it is, feel free to criticise it. I also made the background image by putting together three different images. References are below. I added minor effects like gun shots and explosions as well. If you like this, like and subscribe so I can do more ;)

It was a bit rough. Especially em's chorus vs linkin park in the background. Usually I would let Linkin park sing too, the chorus should be there's since it's a bit more complex and em doesn't sound good over it. They don't even end the song together. Killed it for me. Also too much echo echo echo. Some spots worked pretty good though. Another thing that bugged me was when linkin park was building intensity em didn't. should be ironed out a bit more. the drop at the beginning could be bigger.

Take out the random explosion at the end, I think I like it. Other than Eminem rapping over the piano solo at the end. But nice work.

Yeah this is the first time and thanks for the pros and cons of this. =)

Any suggestions for the next two I should do?

1 has to be Rap
2 can be Rock/Metal/RnB/Dance/Techno

Make it cleaner, the flute like sound almost over whelms his voice.

There should be less echo, the explosions in the chorus ruined it. But overall i like it

But overall your effort is good,

Here are the individual songs
Eminem - Loose yourself
http://www.youtube.com/watch?v=D4hAVemuQXY

and

Linkin Park - In the end
http://www.youtube.com/watch?v=eVTXPUF4Oz4&ob=av2e

I don't exactly understand what you have done to them but I don't think they fit that good together, especially not without a lot of fixing.