I can’t stop singing

So this guy goes to the doctor and says

“Doc, I don’t know what’s wrong with me. I can’t stop singing ‘What’s new pussycat’ and other songs by Tom Jones”

The doctor listens…strokes his chin…and says “Actually, I have seen this before and I know what it is”

Patient: “What’s happening?”

Doctor: “It’s called ‘Tom Jones syndrome'”

Patient: “What? I’ve never heard of this before? Should I be worried? Is it rare?”

Doctor: “It’s not unusual”