Roger,

People have often sung at the Irish session and it is accepted in Irish sessions much more than in English ones but it is never allowed to overwhelm the session. It's usually done with an awareness of the flow of the session. Do you really want to complain about the likes of Alistair Russell giving the occasional song.

I'm not even sure about this particular session being set aside for tunes - it's not actually billed as that. I'll have to ask Steve Morris what his intentions were.