19 April On this day in 1775: In Lexington, Massachusetts, the opening shot was fired – by a British general – in the United States War of Independence. This was the shot “heard around the world”.

CONCORD HYMN (original title "Hymn: Sung at the Completion of the Concord Monument, April 19, 1836") is a poem by Ralph Waldo Emerson written for the 1837 dedication of an obelisk monument in Concord, Massachusetts, commemorating the battles of Lexington and Concord, a series of battles and skirmishes on April 19, 1775 which sparked the American Revolutionary War.

By the rude bridge that arched the flood,
Their flag to April’s breeze unfurled,
Here once the embattled farmers stood,
And fired the shot heard round the world.

At Concord's Independence Day celebration on July 4, 1837, it was first read, then sung as a hymn by a local choir using the then-familiar tune "Old Hundredth". Wikipedia

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Concord Hymn performed by the Choir of First Parish Church Concord,Ma.    https://www.youtube.com/watch?v=W1ApkEnMCwc ;