I've found it's not the singers but the musicians melodeons who talk L O U D L Y through any song they can't accompany (i.e. anything not in G). And they keep up a constant noodling between pieces, so you're not sure if they're about to start a tune or not. This also makes it extremely difficult to pitch a song with these discordant fumblings going on all the time in the background. And when they do start a tune, it's one of the same 12 they have played at this session every week for the last five years and can now nearly get it right.

We used to have a good mixed session, but Gresham's Law means it's now mostly instrumental, plus a couple of singers who can accompany themselves and sing in G.