The fact that music is sold in Walmart or Starbucks makes you angry. You've also gotten angry at “corporate” radio, pop stars, and the thought that people you've never met could ever listen to that stuff.
You think Vinyl sounds better. You will argue this point at length with anyone, especially those who don’t give a shit.
You’ve used the phrase “Spoon-fed” or “The Masses”.
You know not to wear the t-shirt to the concert.
When someone says “Godspeed You Black Emperor”, you know exactly what they're talking about.
Your favourite holiday falls on the 3rd Saturday in April.
You have reorganized your record collection autobiographically, and/or reorganizing your collection is an all-night (maybe even an all-week) project instead of something that takes less than an hour. People who prefer to organize their music alphabetically disgust you.
You are proud that you don’t have certain kinds of music in your collection (you know, the kind of music that somehow gets spoon-fed to the masses).
"Sold-out" is an undesirable phase in a musician's career ("Those guys used to be good before they sold-out"). To everyone else this simply means they got popular.
You like to wear a t-shirt that advertises an indie record label. This is a whole new level of superiority over the other t-shirts you have by bands that no one else has heard of.
You throw rocks at young boys walking home from school because that's the closest you can come to throwing rocks at Justin Bieber.