Is this what is meant by "It will blow your mind!"?

So, there are these things called "mashups" where 2 songs are blended together to make one new song.  I know these have been around for a while, but my interest in them has been renewed.
There's this guy, "Mighty Mike", who puts these things together, and it really is so cool!  My brain hears both songs individually - and together!  And I wonder how he knew they would work together and not sound like a big mess.
Here's my favorite one so far: