Get the Reed Pipe from Apollo's Temple and Click on the Goddess Statue, that is in the temple too, which is holding the reed pipe and she will ask you to copy what she plays and if you pass, you can have the music to play for Cerebus.
You play a song on a flute that puts Cerberus to sleep.
You play the tune once.
Play the song one of the Muses gave you on your reed pipe. This will make Cerberus fall asleep and you can get its whiskers.
In Mythology Island, to soothe Cerberus, you need to play the notes C, E, G, E, C on the harp. This sequence calms the three-headed dog, allowing you to proceed with your quest. Make sure to play the notes in the correct order to successfully interact with Cerberus.
You just get a reed pipe to the right of the common room (Gym) and then you do the same tunes the women with a reed pipe (statue) will give you then she will give you this song and then you will go to cerberus and play the tune that will be in your backpack and cerberus will go to sleep.
you make cerberus fall aslepp by clickin on the flut in the following order , Blue, green,yellow,blue,ren and green. HOPE THIS HELPS :)
You play him the song you learned earlier on the reed pipe.
Play the tune the lady with the reed pipe gave you.
You have to play the flute in the right order to make him go to sleep.
the colors are: blue-green-yellow-blue-red-green.this will put cerberus to sleep so you can get the whisker.
Annabeth saves the trio from Cerberus by playing with him with a red rubber ball. When Percy asks her that how did she do it, She answers:"Obedience school,When I was little, at my dad's house, we had a Doberman… ."Later on, Percy advises Hades to play with Cerberus sometimes:"And it wouldn't hurt to play with Cerberus once in a while. He likes red rubber balls."
In Poptropica, the song to tame Cerberus is "The Song of the Sirens." Players must play this song to calm Cerberus, allowing them to proceed in the game. The song is found during the "Mythology Island" quest, where players learn it from the Sirens.