According to the FAQ, it seems like you can add your own music to the player as well. So portable DJ device. Plus, clever tool by the Kanye team to get a bunch of fan remix tracks in the wild when the album is finally released.
a demo of it: <a href="https://twitter.com/toountrue/status/1430539991780843520" rel="nofollow">https://twitter.com/toountrue/status/1430539991780843520</a>