Sakunosuke KOYAMA, who was the first person to have studied the details of establishing Kimigayo as the national anthem and wrote "Kokka Kimigayo no Yurai (literally, Origin of Kimigayo, Japan's National Anthem)" as his posthumous work started his study from consideration on words.
国歌君が代制定の経緯を初めて研究し、遺作として『国歌君が代の由来』を残した小山作之助も、まずは歌詞についての考察から始めている。