Basically he makes metal songs into 'radio friendly versions' and makes pop songs into heavy metal. What makes it is that he re-dubs the music videos, so the actual bands look like they are playing his version
Two of his best:
Metallica-Enter Sandman (Smooth Jazz Version)
Adele-Rolling In The Deep(Jazz Metal Version)
(Gets good at 58 seconds)
This guy has bucketloads of talent and plays drums, guitars, keyboard and bass