The Shaggs were three sisters from rural New England. Dad musta seen the Beatles, and decided that he was going to get *rich* off his daughters' talent. He bought 'em shiny and matching instruments and marched 'em down to the recording studio to make a record. And....
Of course, he blew the family wad on the instruments, and never got them any lessons. Or bought them a radio. Or gave them time to practice.
So, the girls wind up in a studio with no idea what rock music sounds like, or how to play or tune an instrument. And what you get is the most naive and guileless, yet totally random sound.
I've seen some people call this one genius. I'm unconvinced. I enjoy it for a couple songs at a time, but I don't think that there is a whole parallel universe musical structure here by any means. Just a bunch of kids trying to have some fun singing about their cat. Nothing wrong with that.