Music is something you can do without formal training. Much like how you can be a terrible programmer but still create popular software. Just like how maybe what the world wanted at some moment was a slow PHP alternative to moveabletype, maybe the world also wanted sped up, stripped down, 60s girl band songs, without complicated rhythms and harmonies.

Not trying to say that Wordpress v1 was terrible software written by terrible programmers, but I hope you get my point.