Zappa's in a weird place. Besides classical, he came out of blues and doowop.
Strange too to see the folkies come out of country. Might be better to have a "roots" category giving birth to blues, country, gospel and folk. "I'm so glad" by Skip James, would that be blues, folk or country? And gospel doesn't appear any where.
I'm glad Stevie Ray Vaughn isn't around to learn that he came out of Clapton/Led Zeppelin. Ouch!
And Clapton getting all the credit for Cream is just wrong. Baker was the founder.