Answer to Question 1
the Maghrib, north of the Sahara Desert
sub-Saharan Africa
Answer to Question 2
The answer must go beyond merely considering music from the African continent, and music performed by people descended from Africans living in other parts of the world, the African diasporathe breaking up and scattering of a people -Merriam-Webster's Collegiate Dictionary, Tenth Edition, p. 320.
Music-cultures are always changing and being shaped by many outside influences. Music-cultures interact and influence each other, especially with the almost instantaneous global dissemination of music through electronic media.