I heard this song/songs at AE yesterday and counldn't figure out if they were a mashup or if it was just great crossfading done by the music program.

It started off with Martin Solveig- Hello, then went to Turn Me On by David Guetta and Nicki Minaj, and then i can't remember the 3rd song but it was kinda dubstep/house-y i'd say. I freaking loved the mix though. And just wondering if anyone could identify or if it was just good crossfading.
I've searched all over and haven't been able to find anything! thanks for the help!