Cheap and Easy MP3 Shield for Arduino : 7 Steps (with Pictures) - Instructables
Dfplayer Mini,MP3 Player Module For Arduino UNO Modulo Musica Audio Voice Board Shield TF Card U Disk,DFPlayer Mini MP3 Player Module For Arduino - Newegg.com
1Sheeld - Want to play music with Arduino? Check out this comparison between 1Sheeld music player shield and SparkFun Electronics, Inc. mp3 player shield. http://1sheeld.com/1sheeld-vs-sparkfun-mp3-player-shield/ | Facebook
SparkFun MP3 Player Shield - DEV-12660 - SparkFun Electronics
MP3 Player Shield Hookup - SparkFun Learn
MP3 Player Shield Hookup Guide V15 - SparkFun Learn