Of course, I've heard of Dolly Parton, but not of Crystal Gayle. After reading the article, I went through and listened to their music. Not really my style, although I had heard one of Dolly's songs.
One of my clients looks just like Dolly, now, only my client uses her natural hair. Since they're only about 10 years different in age, maybe my client was going for the Dolly look...or not. On the other hand, everyone looks the same, to me.