Deciding on music for the ceremony or reception should be fun for most grooms. It's as simple as choosing his favorite songs and some of yours. Ask him to make a playlist for the DJ as well as a no-play list. If you plan to hire a live band, ask your guy to research some and find out their availability. The two of you can check out each act and enjoy a night on the town at the same time. You can even send him out with his buddies to compare bands while you focus on other aspects of the wedding.
And if your groom is tech-savvy, appoint him Minister of Musical Bliss and let him rig up your iPod and some speakers. With the money you save, he can choose another variety of beer to serve at the reception.