Why is the answer to another apparently straightforward question—“What music is African?”—also not so simple and clear-cut?

What will be an ideal response?

• 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 diaspora—["the breaking up and scattering of a people" -Merriam-Webster's Collegiate Dictionary, Tenth Edition, p. 320].
• "[M]usic-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.