Yes, Les, it is indeed important to make them feel welcome, and that includes paying attention to what they play/sing. A clubful of bored-looking 50+yr-olds full of in-jokes and little appreciation for the poor bugger doing a spot can be a very scary thing.

I've heard Johnny Collins sing along to "Here comes the sun", and Mary O'Connor too (a source singer that's taught Martin Carthy a song or two in her time), during a youngster's floorspot. So I have little time for the snooty ones.