I was once told, long ago, that sitting versus standing changes the key of the song with which you will be most comfortable. I have found it to be true. As I remember, and I remember less and less each day, you can reach higher notes when you are standing. It is best to rehearse the performance in the mode in which you plan to perform. Rehearse standing if that is how you perform.

In my youth, I always performed standing. In most venues, the floor has been level and the stage has not been raised. If you sit, people in the back cannot easily see you. You are easier to see when you stand.

Now, my arthritic knees often make the decision for me. Sometimes I can stand for a rather long time. Other times, I really have to sit if it is at all possible. A high stool for sitting is a compromise.

In informal settings, I usually sit.

Roger in Baltimore