It's not the Spanish word, it's a singular collective noun. The "-a" or "-ia" suffix are often used to conjugate singular nouns into singular collective nouns.
Australis = Australia
Paraphernalis = Paraphernalia
Animal = Animalia
By the same token:
Electronic = Electronica
If you have several different "variants" of an electronic music, then these variants can be referred to, collectively, as "electronica" in the same way that several different variants of "animals" can be referred to collectively as "animalia".
(I think that's how it works anyway...)
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