The VS1053 Module as an MP3 player | Sound Examples
GitHub - madsci1016/Sparkfun-MP3-Player-Shield-Arduino-Library: A nice and neat library for playing MP3s on your Arduino using Sparkfun's MP3 Player Shield
MP3 Player Shield Hookup - SparkFun Learn
Nr.20 – MP3 Shield – Funduino – Kits und Anleitungen für Arduino