A military song called 'Genko' contains the lyric of "in the summer of the fourth year of Koan (1281)" but does not mention Bunei no Eki at all.
なお、軍歌の「元寇(軍歌)」の歌詞にも『弘安四年夏の頃』という一節があるが、文永の役に関しては何も触れてはいない。