What is meant exactly by the description 'more musical'?

Nobody said that "taste", (innate individual specific ears filters for example or acquired trained perceptive biases) is not important , individual taste can and must play a role in what is perceived as "musical" but in a psycho-acoustics perspective not the main role ...Psycho-acoustics as science EXTRACT the essence of what constitute a musical timbre perception from a set of many subjects , and do not use one particular "taste" ...

For example in timbre experiments, perceptive abilities and evaluation of taste and of innate biases are made then tastes there is but psycho-acoustics is not reducible to taste and is not only about taste ...

Psycho-acoustics maps are necessary precisely because each individual hearing differ a bit from all others , each hearing individual is a specific territory, then we need an encompassing map including all of what is common to all humans hearings specificities... ( the fact that the Fourier possible set of linear maps for example are not the territory even if these maps are necessary is for another discussion 😁)

Timbre present objective acoustical characteristics ,at least 5 , with specific measurable controlable parameters; but without a set of human perceiving subjects , each one with his own trained or untrained biases , there is no experience of timbre and no precise concepts either only noise ...

Timbre exist no more without biased human ears ...But this does not means that timbre, interpreted as musical or not musical, is only defined by "tastes" , it is also defined by the set of measurables and controlled parameters which are proposed to the set of perceiving subjects in the experiments ... The acoustic map is common to all even if the hearing territory differ a bit in each case ...

Then if someone design an amplifier he can use these psycho-acoustic results in his design to make it more "musical" and not only his mere personal taste ...

Taste there is for sure, but it is not mere taste here this is all about ......😊

Musicality is an acoustic concept and experience not a mere taste ...

During that " modeling " proccess human being does not cares about SPL or frequency range: we all learn with out taking care of ears frequency range or each one ears sensitivity.

Actually, yes, every human cares about the frequency and the SPL! This is why alarms and bells are at the frequencies they are- because our hearing is more sensitive at those frequencies. Its also why musical instruments are designed the way they are and thus explains why it does not matter if its classical or gothic metal; the energy distribution across the range of hearing will be very similar.

Taste and the rules of human hearing are two different things. If we share the former its by luck but we all share the latter worldwide.

I will only add that our brain care a lot , not necessarily our ego though 😁, about frequencies and SPL because with the HTRF functions differentials our 2 ears can localize the source of sound in space , very useful when you hunt to give meat to your children for millions of years ...

And precisely to complete atmasphere right comment , taste and general rules of hearings are correlated specifically in hearing aids technology ...

Taste there is, but acoustic and musicality is not first and last about taste ...

Then defining musicality by tastes only is a hidden vicious circle....or said in another way a common place useless fact ...Or using the title of a very known book who spoke about some physical theory impossible to verify, it is  "not even wrong "...

@atmasphere   " During that " modeling " proccess human being does not cares about SPL or frequency range: we all learn .."

That modeling start even before we comes out to the sun ligth. SPL is something that just " happens " and that we learn rigth from the start in inconcious way and then we follow growing up and follow learning about even if no one tell us what means that SPL our ears goes the " modeling " proccess and been aware of different SPLs with out knowing this technically, same with frequency range. All those is only learning, our ears determine the different SPLs we can tolerate even with no explanation: is part of the orgabism capacities. We don't need to know about the term SPL to know which is the levels we can tolerate in different " scenarios ".

R.

It means that the listener is hearing what they think music should sound like.