Where is it from?

I often get asked where this music is from? Well, it's a kind of Mashup I guess. I find midi files on the web and take parts I like from one or another and join them together, and also write my own parts and add them as I see fit. A good example is "Bridge over troubled water" - I used 2 different midi files and also used "power chords" to write the cello and several other parts. I also used the drums from "The Grinch medley"...so, it's 3 songs + my own writing and sound effects (thunder and rain).
Then I orchestrate it for my instrument choices and taste and make a video sheet music out of it.