SHAME NESDEV!!!
It's the first level music from the greatest FPS game ever made, save Doom:
https://www.youtube.com/watch?v=F7dXoNUPE74Oh yeah, and great rendition tepples...
(By the way, does anyone know of a good .ogg file player? I always have to open up audacity.)
Edit: Wait a minute, I just realized there's more to the song, and NESDEV should again be ashamed: It's Flying Battery Zone from Sonic and Knuckles, with Lady Gaga infused into it:
https://www.youtube.com/watch?v=-4ex1I4SFZs(Edit 2: actually, listening again, I don't think they're together and that Flying Battery Zone plays first and then Bad Romance, but whatever. Very creative on that choice tepples.
)
However, the last part is
Wario Stadium Waluigi Pinball. (You messed me up Bregalad...
) This has to be the strangest thing I've listened to in a long time...