At the [Main Menu,] highlight play and press the [Up] arrow on your remote. A jewel will be highlighted, press [Enter]. You will go to a screen that has pictures of all the main characters. Select a head and press [Enter]. You will hear a short audio clip.
There are two jewels on either side of the [Main Menu] selection at the bottom of the same screen. Highlight and press [Enter] on those to hear two more clips.