Well, for this discussion, I thought we were limiting focus to the military unit involved: The US Army, which I have intimate perspective on, having done it for 15 years.
ubergeek
Marching can be done to no music.
Side ranks keep sideeye on the element leader to the side, everyone else keeps side eye to the person on their right.
There are also the marshall with the whips. If all else fails, you keep cadence to that.
In a silent march, you keep in step with the "Clomp clomp clomp", which also, is quite easy to do, and is done often.
Anyone who has served longer than 3 years has done a pass and review.
Anyone who has been to a perm duty station has had a class A inspection.
Anyone who has ever served has marched daily, in formation, from point A to point B.
Double time is a marching speed, aka running, and you have to run in step.
Marching makes up like half the activity of marching band
Marching makes up about 25% of daily life for a solider. We had PT formations, morning formation, weekend safety briefing formations, formations for training sessions, etc etc. If you have an element of troops, of any size, and they need to move from Point A to Point B, you're marching there.
Didn't the SCOTUS rule that the state of Colorado MUST allow Trump to be on the ballot, even though the state had already determined he is ineligible per their rules?
I'm starting to think either you don't understand the topic, or you're being purposefully incorrect here.