Sorry to disagree with most folks here as I much prefer a very mixed session, i.e., singing, tunes, beginners, advanced, everybody welcome to sing/play/listen/whatever, BUT, morally, if not legally, the session belongs to the regulars who have set it up and advertise it. If that means solid fast wall-to-wall reels, or singer dominated or anything else, that's their prerogative, and I would treat my presence there accordingly, either ask if I could join in or sit and listen or go elsewhere, or set up my own session using my rules!!!!