The tag 'by2004a' is only used once. This is the project:
Connecting a Sparkfun mp3 Shield and a QY-1602 or BY2004 LCD to one Arduino
This Fritzing shows how to connect a Sparkfun mp3 Shield and a QY-1602A or BY2004A LCD to one Arduino. (In progress)
This Fritzing shows how to connect a Sparkfun mp3 Shield and a QY-1602A or BY2004A LCD to one Arduino. Is still in progress and it's passing a complete revision in the arduino forums.