Wow, how'd you know?? This is how I respond whenever someone asks about music or movies or what my hobbies are or whatever.
There's little point in gushing about something very specific that they're unlikely to have ever heard of before or have little interest or knowledge of. I'm always happy to gradually expand on it if they ask though, just a little at a time. If they're interested, they'll keep asking more and more questions. But if I lose their interest somewhere along the way, hopefully I haven't said so much that I sound like a big idiot.
I find it's more polite and humble this way, and I also hope I don't waste too much of their time or mine by yapping on and on.