The dogs go to the middle of the galaxy, where Azathoth sits. He's really tired of flutes. Azathoth: Hey! Can you play something else? - How can he even hear the flutes? There are no sounds in space. - It's a mystery.
Pietro: Azathoth! This is Pietro, lord of the demons, speaking! If you follow us to the edge of the galaxy you'll hear a new musical instrument. Azathoth: Okay! I'm on it!
Pietro: We'll tell him that the Earth makes a noise if you angle it! Bissy: But isn't he gonna notice that no music appears when he does that? Pietro: We'll bring a stereo and play some! Bissy: But there are no sounds in space? Pietro: It'll work itself out!