Yet another fad from the infamous ytmnd, the mystery song was played in the background of an entry called "Demon Exterminator". It became known as the mystery song because no one could figure out what it was called or who it was by. It became an internet fad to the point that CNN even did a peice on its popularity. Its title and artist were finally discovered by the ytmnd user PocoLoco to be "Answers" by the group Vigilante.
A: Hey, have you heard what the mystery song is called?
B: STFU n00b this news is weeks old.