Hmmm...to be honest, I don't remember what they played at my graduation (3 years ago). I do know a few that might be good, though. (Warning: all of the following are likely classic rock songs, some may be even older. Anybody that doesn't like this stuff, stop reading now.

)
Van Morrison - Brown Eyed Girl
Bob Seger - In Your Time
Louis Armstrong - Wonderful World
Those are deffinate. The rest? Maybe:
Tom Petty - Learning to Fly (after all, by this point, unless you're living at home &/or going to college, isn't that what you should be doing? figuratively, of course)
Van Halen - Right Now
And of course, there's always: Alice Cooper - School's Out
I'll try to think of a few more tommorow.
Nate