I think a gift card to a book store would be wonderful (former used bookstore owner, here), unless they also sell music. Perhaps, you could select a book yourself. That age is perfect to introduce teen boys to science fiction/ fantasy so I would suggest the first books in a series. I am sure that the staff would help. The first of a Piers Anthony (fantasy) or Isaac Asimov or Robert Heinlein (both classic science fiction). It could open a whole new world!
I witnessed many a transformation during my years in bookstores: personality change from sullen to open and inquisitive, and new interest in school and learning!