Sure, I have attached the code.
There are two libraries (my gLCD library, and a second which is a merger of a modified SD library, the SPI library, the Wire library, and a couple of other bits to control the memory modules and STA013 chip).
Then there is the ino sketch.
I'm sure there are lots of ways in which the code could be improved, but this was one of the first things I made with an arduino. 
MP3 Player.zip (127 KB)