I guess they wanted you to be a Ranger/Bard... and dip Druid to learn the language... or something?
Still, thanks to Incarnum we can thumb our noses at CAdv and its silliness.
I'm pretty sure the prereqs are meant to refer back to the 1E bard, which required you to be a kind of fighter/thief/druid IIRC. The problem is that 1E didn't have the strict leveling structure of 3E, and that bards were absolutely amazing in that edition.
Originally Posted by KKL
D&D is its own momentum and does its own fantasy. It emulates itself in an incestuous mess.