At home I play what I want. I also try to spin what I like into what I feel my audience may enjoy. 99% of the time I'm working with other people's songs and dare say the majority of those songs are "popular." So, perhaps by default, I'm playing what others want to hear and am fortunate to enjoy the same songs.

I believe your goal as a performer is to please your audience. If you're playing for your supper, it becomes even more critical. I also believe if you're playing what you really like to play and can convey your joy to the audience you;ll be in good shape.

If you're playing what you like and get a request, its great to play the request (or as much as you know) as soon as practical. You establish a bond with the requester and demonstrate your openess to their opinions and taste. Generally, the audience will recognize that and reciprocate.

Of course, I just want to play...