https://youtu.be/6HU0mpBN3gcAs has been pointed out, this tune for the end of Birkat Hamazon has a similar chord progression to a very well known melody, much to be heard in the English speaking world at this time of the year. A common provenance? Who knows? Until we find a Birkon from the last supper, we'll never know for sure!Please share.For a downloadable mp3 of this recording, please go to this page:http://danielhalfon.com/multitrack-recordings/