T. what you said is not contestable but it has nothing to do with the subject under discussion. Defiantly we all perceive musical messages and react to them differently but look deeper.
The possess of “hearing sound” implies receiving sound irritations, reaction to them and making use of this reaction, or creating of consciousness acquaintance with the new sensations. Receiving sound irritations, unless some physical impediments in place (for instance health conditions, psycho-offset and etc), is absolutely similar among all humans. This is what the basic principles of musicality are based upon. The theory of harmony, orchestration the evolution of musical instruments, forms and performing techniques and many-many others things, they all based upon the fact that we humans, as the class, have absolutely identical, almost Pavlovian reaction to the identical sonic irritations. There is no discrepancy and no subjectivism in how he hears sounds. The subjectivism exist only AFTER we register the sounds, compile in into Sound and then out awareness builds up our reaction to the heard. Here is, of course, we all different and way in which we react to Sound would be very deferent and ware upon very many variables. However, our reaction to Sound is musicality that is subjective as I said. Nevertheless, the initial recognition of Sounds and rendering then into Sound has nothing to do with person’s mind, awareness of anything like this - is absolutely objective process. Musically is subjective, Sound (as a derivation of musicality but not as the derivation of the Sounds) it is subjective. Sound is very objective ingredient and if a person has organized mind (people in audio mostly do not have it) and the person has self-awareness to properly deal with own mind and sonic evaluations (much bigger topic) then there is nothing subjective in Sound (do not confuse with the Sounds). Once again: Music (Sound) subjective, not Sounds.
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche