I would be interested in hearing MA's perspective on that point. The fact that the PROs prosecute venues rather than bands seems to be a function of the way the PROs have developed and implemented their licensing schemes, rather than any limitation on liability imposed by the Copyright Act itself. The provisions in the Copyright Act defining what constitutes infringment with respect to musical works (specifically, sections 106(4) and 501) do not appear to limit infringement to venues to the exclusion of the bands that perform in those venues.
Technically, this is correct. Any and all parties contributing to the copyright infringement of intellectual property can be held accountable. That includes the band performing the copyrighted material without permission or license.
Practically, I agree with ChrisB2. In a legal sense, narrowing your pursuit to the venue owner is far more likely than naming the band, or any individual members of the band, in a lawsuit. Chances of the band being sued are very slim. Caveat: I wouldn't want to be in the unlucky band members when ASCAP decides to make an exception to the norm and an example of the band. Stranger things have happened.
The real shame here is, ASCAP licensing is an operating expense for a venue that offers anything other than original live entertainment. That includes soundfiles, analog and digital radio, DJs', and cover bands. I take a dim view of a venue that is unwilling to make this relatively modest investment to legitimize their business.
