It's those dang teens w ther internets n textg, dont u no? Cant waste space w punct or rit speling.

Also, most search engines don't acknowledge apostrophes. If you type "a-coming," it will turn into "a coming."

Anyway, the question is, if you didn't have the song (CD, sheet music, YouTube) already in front of you, how would you know it's usually spelled wrong?   LOL

BTW, now when I search for "Christmas Time's A-Comin" I get links to several threads and posts, including the old thread titled "Christmas Time's a Comin' -- but that did not happen when I tried it a few days ago.