I've heard it played during the prelude but not during the ceremony itself. How old are the majority of your guests? Anyone in their 20s associates it (even without lyrics as the intro is so long) with Cruel Intentions--so death and crack. Not really good for a wedding.

Plus if you doing a program "Bittersweet" isn't really a title you want appearing in the program on a wedding day unless you really don't want to marry him. I'd avoid if I were you.