How many drummers were in the Civil War?

Each regiment of infantry was supposed to have 10 drummers (and 10 fifers) - one for each of its 10 companies. Other units (heavy artillery, engineers etc) would also have drummers of course.

Counting gets tricky because (a) some regiments were reorganized or consolidated or renumbered at various times during the war - there were about 2,000 Union infantry regiments, and maybe 800 Confederate infantry regimetns depending on how you count; and (b) many drummers would be discharged, or would desert or died and would be replaced.

Best guess - at any particular moment during the Civil War, there were 20,000 - 30,000 drummers in both armies, with a total of at least 50,000 individiuals serving as drummer at different times.