You keep spelling it "eletronica", in the title of the thread and twice in the thread. It's "electronica", and I think that's probably what's confusing you. It's not a Spanish word, it's just a simple blanket term to describe all electronic music (not just dance music).

Nothing too special about it. Besides, that "humania" example doesn't really work... I mean, in the English language, especially modern-day English, you can't take one section of the morphology and try to apply it to another as a general rule ("they call 'em fingers, but I never see 'em fing").

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My party schedule:
2009-02-21 - DJ Attention @ I'm So Popular
2009-06-18 - DJ Annoying @ People Need To Know Where I'll Be
2012-11-32 - DJ Insufferable ɸ Or At Least the Stalkers I Complain About
2048-06-66 - Spastic & Whocares ¶ Although I'm Actually Flattered
9999-45-81 - Tweaker Gimp ☼ I Probably Won't Even Go To This But I Have To Make Sure I Fill Up All The Available Space Here