While my collection is for wargaming, I have two uses for a band. I do like to make set ups of my collection to take photos, and so non-combat poses can be useful for those instances. But for wargames, I give a morale bonus if troops have a mascot, dog usually; medic; commander figure; mess facility; and musicians in reasonable proximity. So having a band would be helpful. Place them near the regimental or perhaps divisional command post to provide a morale bonus.

German bands often seem to be pretty close to the front lines in WWII, and I think were at regimental level.

In the US Army bands were a divisional asset and typically were assigned as clearing personnel to aid in the removal of the wounded when not actually playing music.

Military musicians were considered non-combatants. That is why they wear distinctive and fancy uniforms to identify them as non-combatants, and don't carry weapons, and why little boys could be drummers, since, in theory, they would not be shot at.

Mike Bunkermeister Creek
Bunker Talk blog