There is only one way to improve musicality...
It is to EXPERIMENT with the relation between the gear and the room acoustic...
do you get it ?
I have no doubt about all of that, but the problem is, that does not answer OP’s question: "what is meant by more musical?"
Now if you want to know with WORDS what is musical... Try to read poetry ...
So when OP asks "what is meant by more musical?" this is NOW what your answer is? You are no longer saying that "more musical" means to buy an Atmasphere amp? What if OP has read some poetry but finds that defining a good poem versus a bad poem is a subjective process as well? What if OP enjoys reading but finds short fiction to be a preferable genre (to him or her) than poetry? Does this mean that OP can never know what musical is?
Acoustics science define "musical" in big books about all acoustic parameters and conceptual aspect of it ...
Okay, I’ve provided two definitions, one of which was relatively concise and concrete and the other which was concise but subjective . . . you have yet to provide ANY definition of "musical", except for a lot of meaningless word soup. Give me a concise definition of musical in 25 to 50 words if you can. And if you try and you find that "having the pleasing harmonious qualities of music" is the best you can come up with, I am okay with that. Then we can go down the "what is music?" rabbit hole.
Timbre, immersiveness, and spatial qualities ...
Okay, expand your definition to 100 words and explain how those properties define musical and I will probably ask you once again if, for an example, the group Mega Death is musical.
Try an acoustician and read it ...
Meaning that you cannot explain what "musical" means?
I suggest Dr. Edgar Choueiri...
How about Dr. Seuss?
And an advice: dont say to someone reading his post that you roll in laughters... The idiot is not always the dude who dont laugh ...
But in all seriousness, @mahgister , OP asks "what is meant by more musical" and you answer that an "upgrade in gear or acoustics" is the definition he is searching for . . . that IS funny!