MP3 speler
Whatever solution you want to create, you first need to be able to read a SD card.

https://www.arduino.cc/en/Tutorial/SimpleAudioPlayer http://forum.arduino.cc/index.php?topic=114704.0

https://www.sossolutions.nl/adafruit-music-maker-mp3-shield-for-arduino-mp3-ogg-wav?fee=4&fep=1645?utm_source=shopping&utm_medium=adwords&utm_term=Adafruit%20Music%20Maker%20MP3%20Shield%20for%20Arduino%20(MP3/Ogg/WAV...)&utm_campaign=shopping&gclid=CjwKEAiAgavBBRCA7ZbggrLSkUcSJACWDexAyIod4ikR6mRDRhXhq4MY4boZbw1ivIhbG2GD7i9E_BoCqDPw_wcB

http://apcmag.com/make-a-simple-arduino-mp3-audio-player.htm/#null