When you’re fighting comic aliens one day and Joe Frazier the next, it can’t be easy to focus on your pop career: this may well be Will’s part(y)ing shot. His stardom took off with such free-flowing grooves as “Summertime”; then for a golden moment his rise to global fame coincided with irresistible nuggets like “Getting Jiggy With It”. It’s downhill from there, but for a while he was as cool as he thought he was.