George Harrison gets the credit. In A Hard Day's Night, a reporter asked him what he called his then long hair style. He deadpanned the reply. "Aurthur". I just prefer Harold.
The most popular hairstyle of the period
Yes, the incomparable Jimi Hendrix. He grew up and started playing in the Seattle area, but he learned to play at the clubs on Jefferson Street in Nashville while he was stationed at Ft. Campbell.