gist:simplesound.ino

#include <PCM.h>

const unsigned char ghost[] PROGMEM = {
   131, 128, 128, 124, 124, 124, //your sound here
};

void setup(){
  pinMode(A0, INPUT_PULLUP);
}

void loop()
{
  if(digitalRead(A0) == LOW){
        startPlayback(ghost, sizeof(ghost));
  }
}