tapsman
/ˈtæpsmæn/Definitions
1. noun
A person who taps out time, especially in a band or orchestra, by tapping on a drum.
“The conductor relied on the tapsman to keep the tempo in sync.”
2. noun
A man who draws beer from a cask, especially by tapping the spigot.
“In the old tavern, the tapsman would carefully tap the kegs to serve the patrons.”