There is no official tune for Birkat Hamazon for Moroccans. I give lots of credit to my Ashkenazi brothers for founding a beautiful catchy melody for this integral part of Judaism. What I've done was taken their tune and adapted it to the standard Sephardic words. (note: The Moroccan version of Birkat Hamazon, has some slight variations and additions). Finally, after adapting it to the words, I made sure to add some Moroccan twists to it. Hope you enjoy!
(The birkat hamazon, was recited with weekday words, not Shabbat)