It's a tiny little music routrine that reads four Bytes from EEPROM and acts on it. If you changed it say to FIVE bytes, then use Byte5 (if say non-zero) to indicate what you want to display. Kinda tough on a 12F chip, because lack of pins means you're having to drive a Serial LCD to send your message, and the Serial LCD will take time (even at 9600 baud), so it will impact on the music giving you an abnormal pause between notes. Better if you choose a PIC with more pins.