Thread:RRabbit42/@comment-3466679-20141122073323/@comment-31352869-20141130035825

They essentially created themselves because an edit by some user was made to the template:infobox song page that essentially gave instructions for the categories to be created for a song when it was edited, and that is why those categories came out of nowhere. That has been fixed by WiKiAN as he reverted that edit to the last revision before that edit.