Mask

Masks cover the face, hiding emotion and personality, like the hood of a medieval executioner or as in traditional Japanese theater.  A mask may allow its wearer to emphasize one facet of themselves, or submerge themselves and perform acts that are totally out of their character.  They also protect the wearer (like armor) from actions of their own and others. Animal masks typically signify a union with the animals themselves, a type of return to the state of paradise.  Information taken from:   Online Symbolism Dictionary

Your persona, the image you see yourself as (this is not the real you, only a part of your true self).  From - Dream Dictionary.

  Songs referenced: 

Happy Phantom