Quick thoughts:
I’m with @sns and believe that sound/music are not separable.
@rvpiano — do you taste an apple without the texture? I think this is an apt analogy, so if you agree that those things go together, you’ll back off of the (false) between "sound" OR "music."
As Brian Eno discovered -- and most others here are mentioning -- the notion that the "best" experience aligns with one kind of attention is a bit hard to accept. It’s like asking, "What the *best* kind of conversation -- a heart to heart about deep topics or a fun, shooting the bull conversation with banter, humor, etc.?" It’s another false choice.
If you’re asking, "Is it a better experience to not be distracted when you’re trying to concentrate?" then the answer is "Obviously, yes." But that’s too easy a question, isn’t it?
Possibly of interest:
https://news.emory.edu/stories/2019/01/er_eno_book/campus.html
"Lysaker is led to consider the different kinds of listening that “Music for Airports” requires.
Even casual music fans would be familiar with background listening, the sonic accompaniment to other activities, and with performance listening, the focus required at a concert.
Lysaker argues Eno’s willingness to use catchy musical phrases in the absence of clear rhythmic structures keeps “Music for Airports” from existing only in the background, while the lack of narrative development keeps it from serving as a showpiece.
That leaves avant-garde listening, for sounds outside of traditional configurations of melodies and scales — for sounds such as reverb — and reverie listening, in which the music initiates open-ended reflection.
Eno’s album provokes each kind of listening. Although no one can listen in all four ways at once, Eno’s deliberate engagement with each of the four creates that hazy and calm new space.
But it also demands more than what German philosopher Theodor Adorno calls regressive listening, what we now think of as those who believe they are fully engaging with music only because it confers some kind of prestige.
“The way we often theorize listening sounds passive,” Lysaker says. “I think Eno is showing that listening is active.”