earthsea_wizard
Explorer
This wasn't specified in the 3.0 description though, which is what this thread was about (started before 3.5 released). This was clarified in the 3.5 text.The Barbarian's Rage description specifically forbids the character from using most skills, as well as any action that requires thought or concentration.
The section on Bardic Music says that Inspire Courage requires three or more ranks in Perform to use it. Since the Barbarian can't use the Perform skill while raging (It's Charisma based), that combinations seems like it violates RAW.
Final answer, of course, is to ask your DM.