Open Best Audio Player
Open Best Audio Player is probably the best audio player in the sense that it does everything for you including finding audio files on your hard drive, choosing which one to play and how, it even listens to the files for you.
It handles a few file formats such as .wav and .mp3 and can play up to five of them at the same time.
It has no controls because there is no need for them, just run the software and enjoy.
It's called "open" of course because it's open source.
The current version is using Beads and still has huge memory leaks, I don't know how to deal with those unfortunately.