Well, you are sort of right but a drummer also used to be an informal way of describing a traveling salesperson, because their job was to drum up business for a company, meaning they tried to increase sales.

嗯，你说对了一部分，但是鼓手也曾经是描述旅行销售的非正式说法，因为他们的工作是帮公司提升业绩，意味着他们努力提升销售额。