Hes turning 18, and I'm 15.
We have only been dating for abour 3 months.
His birthday is in late April, he won't tell me what he wants he said we wanted to be surprise him.
He's in a band, he loves musix, shoes, xbox.
But I want to do something really speical.

You haven't been together very long, so don't spend lots of money on him.

Bake him some elegant brownies or his favorite kind of cookies. When he is 65, he will be raving about you to his grandchildren. (He will have long since forgotten about any XBox game or other merchandise you gave him.)

Its hard to say without knowing him but if he loves his music you could check out eBay or autographs for sale on the internet or music stores and find his favourite singer or band signature! I done this for an ex once and also bought a nice frame to go with it and he LOVED it! Just makesure they're the real deal

Agreeing with Wondergirl, don't spend too much on him, but to make it special, get him something he will "remember and/or use". He's 18, so "homemade junk food" hits the spot.. . Or (what my current wife did) she bought me a very nice dress shirt (that I wore until it had holes in it).

What does he do for work? Does he have a favorite sports team (a hat or t-shirt would rock for under $30.00)

--and as Wondergirl said, an Xbox game will only get traded in after 3-6 months. Funny, I always ask my Wife if she minds if I trade in a game after I am done with it (she buys me GREAT games.. . and I am running out of ideas for her :S
).

Hit the "YES" it's helpful button, but nothing happened. Sorry :(