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Set 013 - Napoleon's General Staff (1) - was produced in 2005. The set included 7 musicians, a bonus Russian C17th Streltsi drummer, and Napoleon resting his foot on a drum. At a pinch therefore, eight musicians and a spare drum.
The contents of set 013 did not constitute a band, and as the PSR review questions, it is not clear anyway why this disparate group of musicians was included in a Command set.
Whatever the case, set 013 is now out of stock just about everywhere. Time therefore for a new and dedicated band set(s)?
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.