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Joined on 8/19/13
It's annoying that Newgrounds is so limiting of genres. I really hope they add more. Personally, for trap, drumstep, future bass, chillstep, etc. I'd put it under dubstep just because it's the closest. You could also put it under "miscellaneous", but I personally don't use that because it's super vague and dubstep is closer. A little tip though: for the "short description", I usually put the genre in there to somewhere so one could see that as well. :/
That's what I've been doing, just been getting annoyed with the messages about Light it Up and Snowcone saying "hurr durr this is future bass/trap not dubstep"