Thanks for the info. Next time I want to know what Amazon means when they sell me "MP3 Music", I will remember to go to body building forums before clicking "Buy"
https://www.amazon.com/gp/help/customer/display.html?nodeId=...
They surely make it difficult to find, though.
Then they launched Amazon Music (or whatever its name is) in my country, which only provides app-based access to music, and also took away my ability to buy MP3s from the US website and neglected to add it to my country's version of Amazon.