"Musical" has not as much to do with taste as with acoustics concepts ( not mere room acoustic by the way but acoustics as science) ...
If we use the word in acoustics where the adjective "musical" can be studied by experiments and described in acoustic concepts : as timbre, transients, dynamic, immersiveness etc ...
It is why people prefered tube amplifiers for years over S.S. because of this objective masking of higher harmonics with tubes easier to do than with S.S. in these days as atmasphere said ...It is an acoustics facts ... not a taste ...
But what makes a system "musical" in his experience has too much factors in it as said Mike Lavigne to be reduced to only amplification ...
Vibrations controls for example or electrical house grid control and not only room acoustic play a role ...
The spatial characteristics of the sound play a role not only the timbre experience ... Then because of the crosstalk effect on any stereo system we loose in the musical spatial characteristics of the sound for example ... Dr. Choueiri wrote much about it ...
And even other well less known factors play a role in our experience of "musicality" ...Including our own inner ears structure which is not a taste as an innate way to experience the sound which we can call our "taste"...But it is not a taste , it is more a starting point ...
We must learn not only how to listen but we must learn how to hear all our life ...