Some bands won’t get up to play without a setlist. For other bands, it’s the norm to read the audience and accordingly choose songs as they go.
If you stand back and think about it, wearing a tie is a pretty strange thing to do. Yet in certain working environments, it’s not only normal, but is expected.
30 years ago, you would be called mad if it took you more than 30 minutes to get to work each day. Now, in urban environments, it’s normal to spend an hour and more in the both the morning and evening commuting.
Just because it’s normal doesn’t mean it’s right. It’s good to take a step back every so often and look at what is normal in your life.