A celestial generally also has two sets of "dissonance conditions" that determine how they acquire notes of dissonance. One set comes from the base Choir or Band, and the other set comes from the Word they serve. Violating these conditions involves fundamentally rejecting their identity (for demons) or their place in the Symphony (for angels), and this rejection manifests itself in dissonance. Dissonance impairs a celestial's abilities in certain ways, and is keyed to spiritual anguish. For example, Seraphim see lies plainly (via use of their resonance) and in turn cannot bring themselves to lie without betraying their natures (which earns them dissonance). Acquiring notes of dissonance, in turn, interferes with their ability to use their resonance. Thus, once an angel starts distancing itself from the Symphony, it runs the risk of getting caught in a vicious cycle that leads it further and further from its angelic nature - and down the path to Falling. Bands do not tend to have a similar problem; a demon typically requires Superior intervention, whereas an angel can Fall spontaneously by itself.