Audio recordings deal with producers and other artists that contributed to the song and want a cut.  This makes recorded songs more strict with regards to copyright because of its expected payout.  Concerts on the other hand are sometimes more lenient with regards to recording when they understand the aura that results from a live performance.  A band that appreciates the presence of their aura is the Dave Matthews band.  In the legal section of their website they state, “Dave Matthews Band allows audiotaping at almost every live performance. We feel that each show is unique and want to offer our fans the opportunity to recreate the live experience through the audio reproduction of our shows.”  Hopefully more bands will begin to understand this concept and allow more recording.  Its interesting though that they only allow audio and no video recording..