This Jingle Bells is in the key of G. That’s a better key for singing than A. On the other hand, A would allow easy use of the open E string for drones.
Then again, maybe F would be the best key for singing. I like F for fiddle tunes, but beginners are not familiar with the finger positions for this key.
This is an example of how choices always leave something behind.
For printing the tune out here is Jingle Bells as a pdf.
This tune is as happy and upbeat a Christmas song as you can find. For a more devotional song, here’s a link to O Holy Night.