[Avodah] Moroccan nigunim

[Zev Sero via Avodah]

Do we have any experts here on the history of the Moroccan nigunei hatefilah?
If so, can someone please explain when/how the Ashkenazi tune for Maoz Tzur
got into the Moroccan liturgy as a tune for Mah Ashiv Lashem?

-- 
Zev Sero               I have a right to stand on my own defence, if you
zev at sero.name          intend to commit felony...if a robber meets me in
                        the street and commands me to surrender my purse,
                        I have a right to kill him without asking questions
                                               -- John Adams