PERCEPTION.Auditive perception is fulfilled through cerebral functions highly similar to the ones that interveen in visual and tactile perception. On the primary cortex level, the auditive stimulus is received in both hemispheres. This could be intended to facilitate a reaction in the case of primary audible stimuli (natural alarms), letís say, that form part of the collective  inheritance. On the other hand, what one could call complex auditive perception, is found "lateralized". In the left temporal lobe, which is known as "dominant", the secondary layers of the cortex are especially adapted for the analysis and the synthesis of talking sounds. In the right lobe, the secondary cortex is in charge of the perception of complex rythmic structures and of the organization of sounds of different pitches, thatís to say, of musical perception. 
Local lesions of the secondary zones of the left temporal cortex in humans, produce loss of ability to distinguish the sounds of language, which is called acoustic agnosia or also sensorial afasia. The same lesions when produced in the opposite lobe, complicating or destroying perception of pitch, timber and rythmic succesion of sounds, receive the name of sensorial amusia. This doesn't happen in the perception of other senses. For example, seeing, functionalized in the occipital cortex, only suffers one type of loss that is diagnosed as visual agnosia. 
Itís common that a patient goes to the doctor expressing his or her uneasyness given that he or she doesnít understand what is heard, the words of others seem to be a meaningless murmur, or what is understood is something totally different. Probably those symptoms originate from the incipient formation of a tumor or perhaps they have an easy cure. In any case, what results difficult for a patient is managing with ease his social, family, or work life, given that the communicative structure of our society is based in the "tiranny" of the dominant hemisphere (we live in a conceptual society!), this is so in eighty percent of humans. For these reasons, itís not common to receive a visit from a patient suffering from amusia, save counted cases of musicians or melomaniacs, so the neurologists have not been able to establish not even approximately a world census of humans suffering from such illness. 
On the other hand, music accompanied by words is always perceived by both cortical regions, but the individual establishes priority order in it.  
Music, as an audible organization whose form is the conductive string of content and whose content is in itself indescipherable, itís abstract and only translatable in physical and mathematical parameters, itís the human practise less "reasonable" of many that compose our social structure of communication and our system of re-creation of memory, thatís to say,  culture. Music apeals to our right hemisphere (non dominant), and becomes practically impossible to find out which processes eases the preferral of a certain style of music over another, aside from existing the generalized suspition that most part of the humanity has not been educated in its musical perception, when one is probably not found affected by numerous shortcircuits (reversible or irreversible) in its perceptive mecanism, whether they be of neurological or physicological nature.