The Shaggs - "better than the Beatles"
The story goes, that grandmother had an insight that the sisters would become a big band. So father tried to make it happen. 5 years of practicing without musical-influences one album (1000 copies), and embarrassing performances.
I've been really getting into what I can find, because it's not music as we know it... take out doing something that you want to do (they didn't) and trying to sell records, knowing what music is etc...
Shaggs are now seen as a groundbreaking outsider music group, receiving praise from mainstream artists such as Kurt Cobain and also from Frank Zappa after he called the Shaggs "better than the Beatles".