Because popular poems of that time are written in both kanji (Chinese characters) and kana characters, it was used as a textbook for reading and writing in Terakoya (temple elementary schools during the Edo period) etc. for a long time.
漢字と仮名文字の両方で当時の流行歌が書いてあることから、寺子屋などで長年読み書きの教科書としても用いられた。