What tune do you play to calm Cerberus on Mythology Island?

In the realm of Hades, you can lull the dog Cerberus to sleep using a reed pipe (Flute) from the Temple of Muses in the Grove of Temples. In the temple, the statue of the muse Euterpe will provide you with the song, but you can play it without passing her test. It is blue green yellow blue red green.