#This should get you Merry.
Merry Arduino is the idea of flashing xmas lights to a sound track (We wish you a merry xmas)
Techno Tree is using standard LEDs, but you guys could change it super easy for strip-lighting leds (xmas lights).
They flash in sequence, travelling up the tree. #HUNDREDDOLLARBILLS
In the area before setup() you can see three relays to the eight notes, so each one represents some number of the notes. For example, pin 8 is the lowest note, and it is the "root" of the song, so it naturally deserves the largest light display.
Wired for a 3-relay version.