This has now been the case for a number of years and I started to wonder what was going on.
It soon became clear.
According to some of his fans, he constantly wears a cap "to make him look more mysterious", "to look sporty", because "his grandmother wore them" or because "he gets really emotional while singing songs n sometimes he cries on stage so he tries to hide his tears".
When he does appear without his cap, he sports an unusual side-parting semi-combover type hairstyle.
This could just be the way his hair grows, but after seeing these old pictures of him I am convinced that he has severely receded temples, almost non existent temple points and that he is a wig wearer.

Before any of his fans start bombarding me with abuse, let me first say that going bald is not a sign of weakness and nothing to be ashamed of. And secondly, I think his wig looks stylish and pretty good. Here is how he looks now.

Norwood Rating : always hard to tell with a hair piece, but I'm guessing at least a 4.