https://youtu.be/M1ILqnnNBcUThis melody for the pesukim sung before Birkat Hazmazon is from the Portuguese community of Amsterdam, where it is also used as a setting for portions of the Hallel and the piyyut En Kelohenu. The arrangement is by Raymond Goldstein.The melody is unknown in London, but a variant, bearing a different time signature, is sung in the Spanish and Portuguese Synagogue in New York to En Kelohenu.Please share.For a downloadable mp3 of this recording, please go to this page: http://danielhalfon.com/multitrack-recordings/