Chorus

Heaven is a place of unbridled energy and wonder, and the Chorus exists as the affluence of all that energy. The Chorus is literally the sound of the Angels singing in heaven, but these 'songs' are more than just musical notes. The Chorus can also be thought of as a network for communication, the Angel's very energy 'sings' his presence to others around him.
Celestial beings can hear the Chorus naturally, even when on Earth. 
Celestials can choose to cloak themselves or cease their 'singing,' which effectively means other Celestial beings can't hear their presence. 
Angel Hearers are non-Celestials who for whatever reason also possess the ability to hear the Chorus. 
Even though Adepts count as Celestials, most of them cannot hear the Chorus. This is because most Adepts are native to other regions of the Omniverse besides Heaven and are designed for their own native environment. The Order of Archangels is the obvious exception to this. 
The opposite of the Chorus is the Cacophony, which is the collected screams and energies of Hell. Of course only Infernals can hear that (or should, for that matter). 
Category:Celestial