Your bardic music provides greater inspiration than normally possible.
Prerequisites: Cha 25, Perform 30 ranks, bardic music class feature.
Benefit: All competence bonuses, dodge bonuses, and morale bonuses granted by the character’s bardic music ability increase by +1. If you have the inspire greatness bardic music ability, it grants one additional bonus HD.
For example, the inspire courage ability now grants a +4 morale bonus on saving throws against charm and fear effects and a +2 morale bonus on attack and damage rolls; your inspire competence now grants a +4 competence bonus on skill checks; and the inspire greatness ability now grants +4d10 Hit Dice, a +4 competence bonus on attacks, and a +2 competence bonus on Fortitude saves.
Special: A character can gain this feat multiple times. Its effects stack. Remember that two doublings equals a tripling, and so forth.
Source: Standard Reference Document under Open Game License v1.0a, which updated this feat originally published in the Epic Level Handbook, page 54.