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It is argued that electron density dynamic's response to phonons at theBrillouin zone boundary is the key factor in the superconductivity mechanism ofMgB2 as well as of all superconducting compounds leading to a real spaceelectron-hole pairing characterized by CP symmetry (Charge and Paritysymmetries) that enables a unified description of superconductivityphenomenon.First principle calculation of the electron density difference isdetermined by subtracting the electron density of the crystal distorted bylongitudinal acoustical phonons at the Brillouin zone boundary from that of theperfect crystal.The origin of this electron density dynamic's response to thiskind of distortion that leads to in real space electron hole pairingcaracterized by CP symmetry is discussed in terms of local polarizabilities anddelocalized transfer of charge caused by phonon-distortion driven dynamicalchange of orbital hybridization. This approach also provides clear and quickguidelines in the search for a new superconductors.

A Unified Description of Superconductivity: Electron Density Dynamic's  Response to Phonons at the Brillouin Zone Boundary Driven Real Space  Electron-Hole Pairing Characterized by CP Symmetry