When I was relatively young, like UD, I would stand and play guitars and sing. Then, after a year or two, my back told me to sit on a high stool and play and sing, which made life a lot easier, and no one in my audiences cared one way or another.

When I switched to an arranger keyboard, I tried standing, but that got old pretty darned quick, so I again opted for a relatively high stool, one with a back rest and foot rest and everything was adjustable. Life was good again, and remained that way for decades to come.

Now, whether you stand or sit has no bearing on professionalism - none whatsoever. Some of the best players and singers, both piano and guitar sat while they played and sang. Among them were Liberace, Jerry Lee, Fats Domino, Harry Belefonte, etc... - the list of pros is endless.

Now, some singers, such as UD, are power singers, they use lots of lung capacity when they sing, especially the higher notes near the top of their range. For them, standing allows them to access every bit of usable lung volume. In my case, I was never a power singer, therefore, I can sing just as well while sitting as I can standing. The same is true with Don Mason, Eddie Shoemaker (Btweengigs),and when they were alive, Joe Ayala, Hank Bowman, Bob Lee and Jimmy McKinney (Jim Sax) just to name a few.

My point is, if you are comfortable standing while playing and singing for 3 to 4 hours, by all means stand. However, if after 4 hours your feet hurt, your back hurts, and you feel somewhat exhausted, then sitting is the best option.

Good luck,

Gary