I have not been able to find a clear, let alone official, answer to this question anywhere.
I am making a Bard with the Archivist archetype and I intend to take the Pathfinder Chronicler Prestige Class. I assumed that the Pathfinder Chronicler's Bardic Performance ability would actually advance the Archivist's performance abilities. I am, however in need of an official answer of some sort.
So if I am a Bard/Archivist (5) and a Pathfinder Chronicler (3) that would, according to the description of the Pathfinder Chronicler, make my effective Bard level for performance a 6. Would I then gain the Lamentable Belaborment performance as if I were a level 6 Bard/ Archivist?
