I mentioned this in passing to a DM, but thought it worth a note. Despite the cool system, bard Songbooks have been limited to a couple of stores, and with Sugriam gone I don't know if they're for sale anywhere in the module.
For the benefit of new bards, it would make sense to have a way to buy or obtain one cheaply in the OOC area. Also, if they were sold by Higgins in the Docks or Tobar.
open the bard shop in these apocalyptic times