Have you seen The mythril eye's npc at the milvaneth sacrarium yet moose? he has a few things to say about the twelve like who worship who and such. Hes on sargatanas i dont know if the sacrarium has been emptied on your server or not.

I'm running through the grid storyline myself right now and during the Treant chase scene(at the beginning) theres a moogle music band that appear to calm it one of whom is playing a horn.