The result it that for a period on one week after such an encounter, each person in attendance will gain a +1% experience bonus above that which they would normally gain. This gain is not cumulative; multiple performances will not raise the percentage of the bonus, but they will extend it until a full week has passed since the last of such encounters.
This bonus can be adjusted for a number of reasons, having to do with the bard's proficiency at performance, further affected by the scale of the performance and the number of performers involved. Large productions featuring high quality performers, supported by multiple artistic forms (such as dance, costume-making, staging and music supporting actors upon a stage) will create higher experience bonuses.
See Creativity, Sukha