Tales and Chronicles
Jewel of the North, formerly know as vincegetorix
I have never seen performance use for anything more important than earning a few coins through busking, so I certainly don't think it's overpowered - I moved it simply to follow the 1e idea of the character taking levels of thief before taking levels of bard (the original prestige class). Note that sneak attack damage advances at level 7. It's not an idea I'm completely sold on though.
yeah, sorry, I forgot you were following the same progression as the old-school multi-class/prestige class bard. In that case, I think you are mostly set. I personally dont like having sneak attack in there, but I cant say I have any better idea.