MP3 Player Shield Hookup Guide V15 - SparkFun Learn
Arduino Project: MP3 player using Arduino and DFPlayer mini MP3 player module from banggood.com - YouTube
JQ6500 MIDI MP3 Player Module – Simple DIY Electronic Music Projects
Adafruit Music Maker MP3 Shield for Arduino w/3W Stereo Amp [v1.0] : ID 1788 : $34.95 : Adafruit Industries, Unique & fun DIY electronics and kits
SparkFun MP3 Player Shield- MP3 decoder- Turn Any Compatible with Arduino Board into a Fully Functional MP3 Player- 3.5mm Audio Out Jack- 0.1" Spaced Header for Speaker Out- microSD Card Slot: Amazon.com:
GitHub - sleemanj/JQ6500_Serial: Arduino Library for the JQ6500 MP3 Player Modules