Death Note - Matt's Theme A B C | Original Themes by Lucas King
Ok, there's a school of thought which says that Matt isn't a major character. It's one spouted by no-one who's ever taken a close look at the fandom and therefore grasps the popularity of young Mail Jeevas.
Now finally this musical deficiency has been made good by Lucas King. He's presented the world with three original compositions, inspired by Death Note's Matt, matching the genre, style and rhythms of those canon theme sets affixed to the other major players.
Let me introduce you to Death Note's Matt Themes A, B and C. They truly are quite wonderful. Thank you, Mr King.