White Mage here just throwing in my two Gath-stolen gil.

If the Bards out there manage to keep Rain of Death more or less up, that damage savings helps me MP and enmity-wise. So even if you're not the top of the DPS chart that run, you've helped saved the party by 10% on a few fronts.

And if you're feeling suuuper saucy during a burn phase/window, run into battle with Foe's Requiem and when I'm in Cleric's Stance, you've upped my damage by 10% (so add 10% of my damage to your DPS). Same for any Black Mages in the party, take 10% of their damage and add it to your score, because you're responsible for it.

I think Foe's Requiem may be the only song (aside from Swiftsong) that doesn't lower your damage.