After defending Prosperity at the end of Act I in Far Cry: New Dawn, you'll receive a mission to find 10 MP3 players. The map above shows the locations of the players.
Every player is stored in a hidden location. Most of the time, finding a player involves visiting a destroyed room behind a wooden wall or a locked door. A detailed walkthrough on how to reach the individual players is found in the walkthrough for Audiophile. Below you can find a list of locations.
Bike Mike's Dale
House on the Lake