Whilst I don't object to anyone singing songs that are in my standard repetoire it seems to upset others! For instance at a session I was at recently someone played a song I normally finish off with. I was then repeatedly asked to it later in the evening. I didn't want to as I felt it wouldn't be right to do it again & as, without bragging, I sing it better it would have felt like I was showing off/having a go at the person who did it earlier.

Since then it's been "will you be doing Xxxxx tonight or will so & so be ruining it". I feel awful about this!

Perhaps the easiest way to avoid such situations would be to leave stuff alone if you know it's in someone else's repetoire.