I am currently building a custom wooden jukebox for my garage and I need a way to fill it with a massive variety of tracks that can be played locally from a small internal computer. Since the garage is too far from my house for the Wi-Fi to reach, the system has to be completely self-contained with all the files stored on an internal SD card. I want to avoid anything that requires a subscription or an active internet link for the player to work. Does anyone know a good way to find and save audio files in a clean format that is easy to organize and label for a custom interface?