"Professor E. Gadd (EU Version) - Luigi's Mansion" is a high quality rip of the EU version of "Professor E. Gadd" from Luigi's Mansion.
Jokes[]
The instruments are arranged to "Skinner & The Superintendent" from The Simpsons. At 0:12, we hear Luigi scream "MARIOOOO!", in reference to Chalmers screaming "SEYMOOOUUUR!" at the song's end.
The rip is possibly a pun based on the advertised track's title: at one point in the relevant Simpsons scene, Seymour Skinner says "Oh, ye gods!" which is sometimes misheard as "Oh, egads!"