How can I play music using a speaker and Micro SD card Module? I am trying to play music using my Arduino and micro SD card module but can't seem to do it. Can anyone shed some light on this? The SD card module I'm using is a Catalex sainsmart micro SD card module. It has the outputs VCC, GND, MISO, MOSI, CS, and SCK. VCC is in 5v, GND is in GND, CS is in Pin 4, MISO is in Pin 12, and MOSI is in Pin 11.
This Arduino project is one of the most simple and fun projects you
  can build with Arduino in 10-15 minutes. The result of this make will
  be an Arduino Audio Player which will play “.wav” files. It consist of
  a speaker, a simple transistor acting as an amplifier and a micro-SD
  card adapter with a micro-SD in it through which the .wav files are
  loaded and played.


https://diyhacking.com/arduino-audio-player/