The downloadable fake book style arrangement available on Wikifonia has the most accurate chords compared to what's on Chordie and others. Having the chords closest to what Richard carpenter used will make it sound the best, and make it even easier to sing over.

You can transpose to any key.

I believe the lyrics are there as well, so you don't really have to read music to use it.

It's a great tune for sure, and a real Christmas classic.

Ian