While this spell is active, you may start a second bardic performance while maintaining another. Starting the second performance costs 2 rounds of bardic performance instead of 1. Maintaining both performances costs a total of 3 rounds of bardic performance for each round they are maintained. When this spell ends, one of the performances ends immediately (your choice).
Virtuoso performance does not stack with any other method of maintaining simultaneous bardic performances.
Section 15: Copyright Notice - Pathfinder Roleplaying Game Ultimate Magic
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.