You can weave bardic music effects into your songs in such a way that your song-performing and bardic performance become indistinguishable.
Prerequisite(s): Bardic performance ability.
BENEFIT
Whenever you perform a 1st or higher level song while you are maintaining a bardic performance, you can maintain the bardic performance for that round without expending one of your rounds of performance for the day. In addition, you can switch from one bardic performance to another as a swift action when you perform a song while maintaining a bardic performance.