Try this code, and start the Serial Monitor after you upload:
#include <SoftwareSerial.h>
#include <RogueMP3.h>
SoftwareSerial rmp3_serial(6, 7);
RogueMP3 rmp3(rmp3_serial);
void setup()
{
Serial.begin(9600);
rmp3_serial.begin(9600);
Serial.println("Starting rMP3");
rmp3.sync();
Serial.println("rMP3 Ready");
rmp3.playfile("/gold.mp3");
Serial.println("File playing");
}
void loop()
{
}
Let me know what you see in the Serial Monitor.
b