The aim of the board is to prove to others that you have a more obscure taste in music than anyone else. The one who has the most pretentious/obscure taste wins, but no one ever wins. Also posting Insane Clown Posse is an instant fail.
It is also the most pretentious thing since Dragonforce.
Anime_Expert.jpg also originated from /mu/. Whenever someone talks about Japanese music, he appears. Though, the picture is so damn exploitable, it's been modified many times over, and is mainly used when someone makes a statement that is stereotypical of fans of the genre/band. This post is then copied, then posted with the corresponding expert.