Soree for deserting the thread for a bit.
A few good points raised above, but i failed to mention, the notion of perhaps nuturing his festering ability will not work, because in his eyes, he is one of the best musicians that ever walked the earth, and has no need to stoop as low as to be listening to constructive critisism about himself.

To clear up the setting of the session raised early on, the story is thus
5 years ago one of the local publicans asked us to do a tuesday night session for two weeks, which went so well, it was extended for a month, which went so well it was extended for the summer, which went so well, well it's 5 years later now and a regular fixture, firm favourite with local musicians and customers.
The pub is split into three bars, the first one you walk into through the door is where we host the session. Myself and 2 friends are the main stays of the session (we get paid) and on average are joined by 8 other musicians, sometimes more, sometimes less, who come for the evening out, and nothing else, Amongst the crowd are always a handfull of talented local singers who are called upon to do their piece, and generally good order is, well, the order of the day. If people have no interest in the music, they take themselves off to one of the other bars, leaving us to it, as it should be.
As the person who was asked to start it, it is me who is the host, m/c of the night and we have a good time, so it therefore falls on my head to keep the session in good order, which is where the problem lies, Maybe as suggested, i should just tell him to FUCK OFF, but i would feel soooo bad for doing so, although i'm sure there'd be a round of applause and a few drinks got for me!!
Till later catters!