Taking it you meant the YT version, which I too have always sung unaccompd, I got my guitar out to try an accompt. I found that one minor chord would do for each line, of verse & chorus, without change, as this is one of those tunes that end on the dominant. It came out as

1st line - Amin
2nd line - Dmin
3rd line - Amin
4th line - Emin

Try that.

Hope this helps.

~M~