Question: What is shared by the official U.S. state song "The Song of Iowa" and the German Christmas song "O Tannenbaum"?
Sentence (from "The Old North State (song)"): Written by William Gaston in 1835 and set to an arrangement composed by Mrs. E.E. Randolph in 1926, it was adopted as the state song by the North Carolina General Assembly in 1927.
Relevant evidence: No