The original sheet music:

Title: To the Mast Nail Our Flag. The Pirate's Song.
Composer, Lyricist, Arranger: The words by L.E.L. Music composed by Horatio D. Hewitt.
Horatio D. Hewitt Publication: Boston: Geo. P. Reed, 17 Tremont Row, 1846.
Form of Composition: strophic with chorus
Instrumentation: piano and voice
First Line: To the mast nail our flag, it is dark as the grave
First Line of Chorus: It shall never be lower'd, the black flag we bear
Dedicatee: Respectfully Inscribed to Miss Eliza Gaither of Washington, D.C.
Engraver, Lithographer, Artist: Bufford & Co's Lith. Boston