Additonal songs cannot be loaded into the EZ-220. However, the keys can light up via MIDI as follows: Connect the USB "To-Host" port with a USB A/B cable anf install the latest driver from here:
http://download.yamaha.com/usb_midi/ Obtain sequencing software such as Steinberg's Cubase, then load and play Standard MIDI Files in the software. The keys will then light up via MIDI.