A lot of it isn't much singing. It's low talking, plus it's drowned in reverb. Double-track and reverb are great ways to hide poor pitch control in the mix.
Just funny how some things just happen.
Roy Orbison was painfully shy, but also had really, really poor vision. He wore thick glasses that were necessary for him to see the audience. On one trip, he realized he'd forgotten to bring his "normal" glasses. All he had on him were his sunglasses.
With no choice, he hit the stage wearing his dark glasses. Between that and his quiet, shy style, the fans thought he was deep, brooding, and mysterious. After that, his manager forbade him from appearing in public or performing without sunglasses on!
