The Singing Goths
The Singing Goths, like many of the characters in French Erotic Film, were found on the "Cliff Yablonski Hates You" page on www.SomethingAwful.com. They weren't singers on that page, but everyone knows that Goths don't like to be ridiculed, so Andrew Kepple turned them into (ridiculous) singers.
The Singing "Goths" are actually black metalheads in corpse paint, the makeup that black metal bands wear on stage. Corpse paint is particularly common to Norwegian black metal. It's a common misconception to call them Goths, since black metal is a slightly obscure genre, known predominantly by metalheads.