Here are a few of my favorite guides/discussions about bard.

This one covers all things for bard, from skill priorities to song usage:
http://angered.guildwork.com/forum/threads/547331fa002aa80a955514ad-endgame-bard-guide-by-krietor

And this is one of the most helpful-in depth bard discussions i have seen. But it mainly covers the opening rotation:

http://www.reddit.com/r/ffxiv/comments/1vrv6b/endgame_bard_discussion_opening_rotations_cd/

*Disclaimer: the reddit one is an old discussion. The rotation is still viable, but just dont quote the DPS numbers they are giving.

And now a entertaining flow chart ^.^
http://i.imgur.com/Q3dTunk.jpg