It was indeed Roy Orbison...
One of the girls from my IBD support group got "I am Henry the Eighth I am..." stuck in my head last night. She told me to keep singing it and it would help put me to sleep. My meds have made me an insomniac, and I'll try anything to get at least 4 hours of sleep!
BTW- it didn't work. I just ended up singing "I am Henry the Eighth I am. Henry the Eighth I am, I am..." til 5am