Player>Custom Audio playback - *.mp3 Filelist Blueprint?

For a F2P, very simple FPS Zombie Survival Shooter Type Game/Level for PC,
I´d like to provide the Player the option to browse/specify a custom folder for their custom,
personal soundtrack or at least implement an automatic *.mp3 file list update for an existing
“soundtrack” folder.

In Blueprint. Maybe even with a random function.

Sort of hooking up your own IPod and hitting Random Play while playing the Game but without hassle…

Just an install folder look up feeding into the Game´s “Soundtrack” and automatically updating based on
folder content?

That would be really nice.

Ideally, I´d want to implement similar functionality for mobile&HTML5 but I know blip about that either…