I second Jeri's comments and would like to pass on my own:

WAHOO!

I also suppose I should provide something more to the point. I agree we should focus this more on singing than tunes but how can we restrict an open forum? One way is to clearly state its purpose at the outset and to ask everyone present not to start or, if one gets started, encourage or join in to a set of tunes. Let it peter out. The tunester will get the message if no one joins in.

The host will also have to be clear at the beginning of the session and whenever the tunes people try to take over that the session is a SINGING session.

Now, if you will excuse me, I have to go learn some songs...