someone who thinks they are the biggest fan of a band and if someone doesn't know everything about the band they are not true fans.

A music snob listens to more music than you. As a result they are able to make a better informed judgement on what music is best as they have listened to a wider spectrum of styles. They spend their spare time digging around for music that they perceive to be better than what has been spoon fed to them by the radio. This allows them to hear music that doesn't get credited by major media sources and so aids them in making a better judgement on what music is better.

Often dismissed by others as only liking music on the basis that it is obscure, skeptics of music snobs often choose to make this misinformed judgement because they don't understand the appeal of finding out about less mainstream music. In reality the music snob will prefer less mainstream music solely because it is more original and sounds better.

Someone who has dedicated many years to studying and practicing complex forms of music, thereby giving them the ability to easily identify repetitive themes that are constantly recycled and resold in today's popular music.

someone who listens to music or bands that aren't that popular yet. whether it be good music or not, they don't like to share it.

Someone who listens to better music than you.

someone (me) who believes that their music taste is all defining. which, obviously, it is.

Someone who really cares about music, and thinks it's so very sad the way it has been cloned, processed and sullied by huge corporations. Also music snobs really care about the fact that everyone walks, talks, and acts the same and that individuality is dead. They are only trying to help you when they mention bands that you should listen to, and are only trying to help THE WORLD when they tell you you are acting like a sheep. It's too bad you can't see that, but you're already sucked in too far into the machine.