If your singaround is made intolerable by folks talking to each other in the pub, why not gather in in your kitchen, where you can ensure that every singer gets full attention? As for sessions... If there's really so little empathy between singers and instrumentalists that you actively annoy one one another(!) then why not just stop playing and singing for an hour or two and talk to *each other* in the pub? The one thing that sessions can really do without is enmity.

Peace, love and mine's a pint.....