You can blend the power of your performance and spellcasting.
Benefit: You can combine your bardic performance and your spellcasting in two ways. First, you can conceal the activity of casting a bard spell by masking it in a performance. As a swift action, you may combine your casting time of a spell with a Perform check. Observers must make a Perception or Sense Motive check opposed by your Perform check to realize you are also casting a spell. This uses 1 round of your bardic performance ability, regardless of the spell’s casting time.
Second, as a move action, you can use 1 round of bardic performance to maintain a bard spell with a duration of concentration. You can cast another spell in the same round you are using bardic magic to maintain concentration; if you do this, your concentration on the maintained spell ends when you end the bardic performance the spell is part of.
Pathfinder Roleplaying Game Ultimate Magic. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.