15 Hot Music Genres You'll Be Thrilled To Discover      Those of you who've only followed the Present Author for the past couple years may be surprised to learn that I used to write about music. No, really, a lot. It's been a while since I wallowed in the discovery of new bands.    What I'd like to do for the world this Christmas is illuminate some little-known, niche music micro-genres. Most of them are new, some of them only established after the fact or experiencing a retro revival, all of them are judged to be popular and trendy based on stats gleaned from Spotify (mostly), plus iTunes, Bandcamp, SoundCloud, YouTube, and whatever crazy noise I can run into on the street. I will try to keep it to genres established enough that they won't just disappear by the time you read this.    That's all we're doing. So if, a few days from now, you just received a new music-playing gadget and are looking to load it up with cool new beats, you're bound to find one genre here worth exploring.      #1: Witch House          …