Singers can be a bit demanding in their search for undivided attention. On a social occasion it is only natural attention will lessen once singer number three, four five, six or seven is ready to do their bit. Especially if not all present are there specifically and only to listen to singers.

On many occasions I have also noticed singers who don't see a problem in making a racket while instrumentalists are playing, demanding utter silence and respect once the thought of singing a line comes into their head.

As in many situations, there needs to be a bit of give and take. A bit of sense, understanding and decency go a long way.