Master and Commander: The Far Side of the World (2003)
Peter Weir's 2003 Patrick O'Brian adaptation. Russell Crowe as Aubrey, Bettany as Maturin.
Actor: Billy Boyd
Billy Boyd played Pippin across the Lord of the Rings trilogy and sings the lament in The Return of the King, which he composed the melody for himself. He is Scottish, worked as a bookbinder before acting, and fronts a band. He also appeared in Master and Commander alongside Paul Bettany.