Bard enhancements (history)

Level 1
''
 * Devotion I: grants a 20% increase to the effectiveness of the bard's first level healing spells
 * Energy of Music I: grants an additional 20 spell points
 * Extra Song I: grants the ability to perform 1 additional bard song before resting.
 * Inspired Bravery I: Inspire Courage gives an additional +2 bravery bonus. ''(This bonus doesn't apply to attack and damage, so it must be to saves vs. fear.)
 * Skill Interaction I: +3 on Diplomacy and Bluff checks
 * Skill Magic I: +3 on Concentration and Perform checks

Level 2

 * Bard's Charisma I: Charisma +1
 * Energy of Music II: grants an additional 25 spell points
 * Improved Devotion I: grants a 30% increase to the effectiveness of the bard's first level healing spells
 * Inspired Damage I: Inspire Courage gives an additional +1 bonus to damage rolls

Level 3

 * Energy of Music III: grants an additional 30 spell points
 * Extra Song II: grants the ability to perform 3 additional bard songs before resting
 * Greater Devotion I: grants a 40% increase to the effectiveness of the bard's first level healing spells
 * Inspired Attack I: Inspire Courage gives an additional +1 bonus to attack rolls
 * Skill Interaction II: +4 on Diplomacy and Bluff checks
 * Skill Magic II: +4 on Concentration and Perform checks

Level 4

 * Devotion II: grants a 20% increase to the effectiveness of the bard's first and second level healing spells
 * Energy of Music IV: grants an additional 35 spell points
 * Inspired Bravery II: Inspire Courage gives an additional +2 bravery bonus
 * Inspired Damage II: Inspire Courage gives an additional +2 bonus to damage rolls
 * Music of Makers: Additional song ability that can be used to fascinate construct.

Level 5

 * Bard's Charisma II: Charisma +2
 * Energy of Music V: grants an additional 40 spell points
 * Extra Song III: grants the ability to perform 5 additional bard songs before resting
 * Improved Devotion II: grants a 30% increase to the effectiveness of the bard's first and second level healing spells
 * Skill Interaction III: +5 on Diplomacy and Bluff checks
 * Skill Magic III: +5 on Concentration and Perform checks

Level 6

 * Energy of Music VI: grants an additional 45 spell points
 * Greater Devotion II: grants a 40% increase to the effectiveness of the bard's first and second level healing spells
 * Inspired Bravery III: Inspire Courage gives an additional +3 bravery bonus

Level 7

 * Energy of Music VII: grants an additional 50 spell points
 * Extra Song IV: grants the ability to perform 7 additional bard songs before resting
 * Skill Interaction IV: +6 on Diplomacy and Bluff checks
 * Skill Magic IV: +6 on Concentration and Perform checks

Level 8

 * Bard's Charisma III: Charisma +3
 * Energy of Music VIII: grants an additional 55 spell points

Level 9

 * Energy of Music IX: grants an additional 60 spell points
 * Extra Song V: grants the ability to perform 9 additional bard songs before resting
 * Skill Interaction V: +7 on Diplomacy and Bluff checks
 * Skill Magic V: +7 on Concentration and Perform checks
 * Inspired Damage III
 * Inspired Attack II
 * Inspired Bravery IV

Level 10

 * Energy of Music X: grants an additional 65 spell points

Unconfirmed
The following enhancements appear in the game data files but their implementation has not been confirmed yet.
 * Inspired Attack III
 * Music of the dead I

Note

 * Inspire Attck does not stack with "Good Hope" - only for atk. bonus!