Eric you really know how to create moods/vibes with your playing. That has always been the most important thing to me as a listner and fan, no matter what I am listening to. Using this background track is really cool cuz it already has a cool vibe to it. Also you are doing something which most guitar players from our generation have not. Sampling (or in this case using midi file) of someone else's music. You are giving them credit as you should, so its not ripping off. If you ever release it all you have to do is get permission leagaly, which I am pretty sure they can't vito, and pay a small fee per copy sold. Just think of how many kids you may turn on to guitar by doing this. You may have been just messing around but this could be a really cool Eric guitar mix of Eminem. Good job.