Hmmm, well, rock music worked, for me at least, whilst watching A Knight's Tale (Heath Ledger also worked for me as the lead character, but that's another story). So perhaps if the music fits the imagery, then I say rock on.
My "screenplay," which is now in the works thanks in part to some of you Pyracy Pub people, is a DROMEDY, rated a very strong R for Language, Nudity, Sex, and Violence. Whee! While I seriously doubt it will ever make it's way into the hands of a studio for their kind consideration, it will certainly be printed on 70mm cinemascoptic celluloid in Dobly Digital Surround that I loving refer to as "my brain on Depp."
Who would play the HMFIC? Gotta be Depp, but I'd have him a little cleaned up. Minus the dreadlocks, minus the grime under the fingernails, minus the funky gotee. Hair in a ponytail---looking more like himself, but keep the kohl 'round the eyes. Add a large gold earring and more than one shot for the pistol, and several major love scenes. I'm certain Disney wouldn't stand for this one bit. Lawsuit?
But here's the good news. Arch enemy #1 would be Benicio Del Toro! He'd be another pirate (from Spain), but more wicked and evil than the Depp pirate, and several R-rated scenes containing more nudity, violence, language and sex, not necessarily in that order. Hoo-raaahhh!
As far as the score goes, I'm into gypsy (flaminco) music at the moment, but I don't think it's appropriate to the period. But who am I kidding? I don't know jack about the period.
All I can say is the score would be all instrumental. I can't stand musicals. Perhaps something Pink Floyd-esque?