Beginning in the early 1860s, the Marine Band performed on the East Front lawn of the Capitol every Wednesday during the summer months. Attesting to the popularity of these lively events, news outlets published the programs in advance, and crowds of more than a thousand attendees were reported.
History, Art & Archives, U.S. House of Representatives, “Music Evening at the Capitol Grounds, Washington, DC,” https://history.house.gov/Collection/Listing/2003/2003-033-007/ (November 15, 2019)
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