my take on this:
there are at two ways that we can enjoy a piece of music:
1. emotional
2. analytic/rational
1. emotional refers to how we feel immediately upon hearing a piece of music (e.g if a song is catchy we immediately feel an emotional string plucked inside us, or the melody is beautiful, or the lyrics speak to us on an emotional level, or the beat makes us wanna snap our fingers
this type of listening is predominant and it encompasses all superficial=emotional reaction listeners, dancers etc but also nitpicky people like us. we, prog fans or other complex music listeners share this emotional level with all people but what differentiates us from others is
2. analytic/rational is that we tend to invest more time and energy into our music for whichever reason that might be. we get a kick out of emotional aspect but while most people are satisfied with that, we are not. we search for intricacies, technicalities and all other things that make a song more saturated with listening items that makes for a longer enjoyment and more mentally/rationally challenging listening. we like a balance between emotion and ratio
that being said, there is no way you can tell who is more inteligent because an inteligent emotional listener might not be that much interested in music because they have other areas of interest where their inteligence sparkles and they have no need to analyze music. on the other hand, there's no guarantee that analytic people are inteligent because they might be music anlytic "freaks" where they might lack in general intelligence or they might not be so analytical as they think and they listen to prog/classical for the emotional kick not rational. and i think that genuine intellectual curiosity/creativity is what counts with these people
if I may be biased towards pleasing my ego, I might say that intelligent awareness of the two might signal a wise and intelligent person