my last campaign world had an Arabic / medieval Islamic style going on, so the bards of that world were slightly different. because society frowned upon music and dance as sinful, bards were extemporaneous speakers and storytellers. they'd recite poetry or use highly stylized debate and oratory techniques that provided the same sort of bonuses that normal bardic music gives. one interesting change this required was that all of the bard's Perform-based magical abilities became language-dependent (if you can't understand what he's saying, you aren't affected by it).
i changed the name of the class to rawi -- which, as far as i can tell, means "a storyteller or transmitter of oral literature." for those familiar with Al-Qadim, i had also considered calling them sha'ir, an Arab term for "an enlightened one," but was mainly used historically to describe great poets.