TIL that the controversial Billy Boys song is set to the tune of a union civil war song, Marching Through Georgia.

https://youtu.be/H-jtYT5COvU?si=pKZkcPqUaqV7qD1t

https://www.reddit.com/r/todayilearned/comments/162cbab/til_that_the_controversial_billy_boys_song_is_set/