I always thought this was a fun question to ask some of my friends. This world we share is socially huge, so there's always someone with an opinion and perspective different from yours. Not just what you listen to, but why do you listen to it? Electro, dubstep, house, trance, techno, jazz, rock, hip-hop, rap, R&B, etc. Whatever it may be, whatever sub-genre it is, why do you prefer that over something else?
Personally, I mostly listen to house, dubstep, trance, rock, and everything stemming from them because they make what's playing on the radio seem like shit. Don't get me wrong, I love the radio, but I lived in Sacramento, California. Almost every station played top 40. The only ones I listened to played alt. rock, jazz, or classical music. I live in the Philippines now, but stations are still playing the same stuff back home.
But if you don't want to read all of that, answer these questions:
1. What do you listen to?
2. Why do you listen to that?
Stay positive, polite, and constructive, people!