Boston Hymn
... that Ralph Waldo Emerson commemorated the Emancipation Proclamation by composing "Boston Hymn" and surprising a crowd of 3,000 with its debut reading?
... that <a href="./Ralph_Waldo_Emerson" id="mwAiY" rel="mw:WikiLink" title="Ralph Waldo Emerson">Ralph Waldo Emerson</a> commemorated the <a href="./Emancipation_Proclamation" id="mwAic" rel="mw:WikiLink" title="Emancipation Proclamation">Emancipation Proclamation</a> by composing "<b id="mwAig"><a href="./Boston_Hymn" id="mwAik" rel="mw:WikiLink" title="Boston Hymn">Boston Hymn</a></b>" and surprising a crowd of 3,000 with its debut reading?