You can use it through arsd.simpleaudio's playMp3 function for a very easy high-level api to just play the sound. If all you want is the mp3 sound to come out your computer's speakers, use that api. If you want to inspect a mp3 file's innards, play it through a different api, convert it to different formats, etc., this module may help you.
This module used to be based on a different minimp3, written in 2008 and based on ffmpeg code. On November 20, 2020, I replaced it with the newer implementation (which is the designated successor of the original minimp3). Since the implementation was all private previously, this meant little outside breakage, but some attribute qualifiers changed.
The new minimp3 implementation is public, but not part of the official arsd.mp3 API, so I reserve the right to change it again without notice. Only the MP3Decoder has stability guarantees. (Though I am unlikely to change what works.)