origin of the name in spanish 

"Vidence" is the faculty of interior perception of a deed or future situation. 
"hearness " is the generic word for the ones that hear
There is no symmetry in these areas of language (the audition, in a magical context, would be, symmetrically, an "evidence"). 
All that occurs in time, is instantaneous. Music is real. Who produces it is a transductor. Who perceives it is a "metaphorizer" or creator of metaphors, and here the sound parts from the instant to become memory or desire; desire and surprise are simply two extremes of fantasy, and fantasy is the only factory of reality (which we often confuse with production, even though this is nothing but an adaptation of materials to the consumption standard. Memory is culture. We interpret the future in desire terms, that’s to say, in a foreseeing kind of way. Memory is an accumulation of data that we call experience. Desire is interested speculation in which individuality merges: when we hear music we don’t expect what will please us, rather that what in the context of what we are listening to will satisfy the structure. When we detach the sound from the organized concept we find ourselves in front of an alleged contigency that in fact is surrounded by preestablished parameters. It’s worth mentioning that the more sophisticated a chance generation system is, the less kaotic the outcome is and, therefore, more deceiving.