*LOL* Gervase- been there!Kris, I go by audience reaction a lot. I never used to like to sing the same song twice in the same place, which causes problems with repertoire... then I realised that people like to hear familiar songs too. Then when you start getting requests- what a wonderful feeling!
I suppose that if a muffled groan runs through the audience when you start your familiar song, it may be just a tad too familiar.... :0)
Noreen