We typically build with some standards, then chill with a song or two that we like (as long as they are at least relatively well known). To be honest, it is - like you said - like a magic power. We’re all magicians, and we all know how to do the same tricks. That doesn’t matter though because we’re not performing for each other, we’re playing for the audience. We’re not in the business of playing artistically brilliant songs, we’re here to give the audience a great time. A song everyone can sing along to will trump a “good” song every time. So a set of standards is no bad thing, really, it just may be a bit boring for the muso.