Bracketing the snotty condescending hipster thing for a minute, having good taste in music means that you have a wide-ranging knowledge, you can identify the best stuff within each genre and period, and you know what other people will like before they do. This last part is crucial. I like what I like, and that's fine. But the reason I know I have good taste is that I can put together a playlist that you will enjoy, whether you're my mom, my wife, my baby, my friends, or any group of strangers.