Inspire Spellpower

 
Prerequisite(s): Bardic Music, Perform (Any) 8+ ranks
 
Benefit: You gain the following Bardic Music ability: Inspire Spellpower (Su): Your performance affects ally spellcasters that can see and hear you. As long as you perform (and for 5 rounds after you stop), all of their spell DCs increase by one level. This does not affect you however.
 
Source: Races of Stone