I’d use UMG for the interface. You’d definitely have to dip into C++ though, at least as far as loading music files from the computer.
The biggest hurdle here is that UE does not natively handle MP3, so you’d have to either write your own codec (good luck!) or somehow ensure that the library you’re loading is in .wav format which doesn’t have ID3 tags so you will end up having to use the filename.
It’s a messy endeavour but can be done.