While we're on the subject of decolonising music history/teaching: the first piece of music made by manipulating tape recordings is from Africa. Halim El-Dabh wrote "Ta'abir al-Zaar" ["The Expression of Zaar"] in 1944.
You can find out more about him from his website: http://www.halimeldabh.com/
Note that he was spotted by the US government as a talented composer and recruited to a US University, so there's not a good excuse for ignoring his work, and yet he's not often discussed.