I love hearing about "first" birthdays! My 'baby' just today celebrated her 23rd. She's always loved parties and birthdays, so we started last nite, by going out to eat at her favorite Chinese restaurant, even though the rest of us wanted something different.
Today she had her chocolate on chocolate cake, we had a bbq, and I gave her a jewelry box with a couple of charms for her charm bracelet...and I always put a little cash in her birthday card.
How about a Music store gift certificate...you can even get Amazon.com online certificates, they have all kinds of music, sounds like something he'd like.
Just having you wish him Happy Birthday will probably be a special gift in itself!
Enjoy!
aj