This is not a full-fledged indicator, but one of the signs. And even then, the patterns are not always visible, but only if a person consciously chose this or that music and takes it seriously. Nevertheless, rap, synth pop and the like are characteristic of low intelligence - the composition ends on 1-2 sounds, and the lyrics descend to lust, consumerism, empty pathos, belonging to a large and ferocious pack. Yes, they even have the same drum samples, what can you even talk about? Rock and metal are characteristic of high intelligence. The historical complexity of the compositions allows composers to create a large number of truly unique pieces. It is not hard to guess what kind of person will be able to see the subtleties, details, interesting ideas, describe the idea and approach of the composer / instrumentalist. And I'm generally silent about the topic of a strong personality. Well, you know, 50 years of evolution in a world that changes almost every hour is very significant.
This does not mean that if you immediately run to listen to metal, you will instantly become super smart. After all, the brain develops up to 27-30 years. And nobody canceled posturing. But this collection of genres gives more assurance that regular listeners can see a lot of subtleties. And this, I remind you, is the most obvious sign of intelligence.
It depends on what you call "intelligence level". The level of intelligence? Logic? Abstract thinking? Memory? Mindfulness? The criteria are different. Only abstract thinking and memory can be directly related to music.
The fact is that music is the most abstract of all arts. It is just a system of sound metaphors cleverly organized in time. She does not pretend to be anything, she does not try to imitate anything.
And the more, richer, more original these metaphors - the more brain effort is required from the listener. To listen to a half-hour symphony and not forget in the second minute what was played in the first, you have to work hard, right? It is no longer just consumption that turns out. The more sophisticated the listener's ear and memory, the more complex musical structure he is able to keep in his head. The better the abstract thinking is developed, the deeper is the understanding of the author's idea. And more fun. Big music tickles our brains, gives a massage to our consciousness, and nothing in the world knows how to do something like that too.
There are many exceptions. A person may simply not like music as a class. A person can listen to it solely for a utilitarian purpose (create a background, for example), and not think that something can be explored in it. And be smart and all. You can listen to Mozart, because "the violin sings merrily". You can listen to yard songs and tremble with all your soul from every note. Anything can be.
If you answer the question in one line, then - no. But the presence of interest in music in general, the ability to understand it and the desire not only to consume it is a sign that there is something in the head and it is capable of something. One of the signs.
Very even, although there are exceptions. I know several examples of people who listen to approximately the same music and are similar in character and outlook on life. And in myself I can say that, in principle, the characteristics of their favorite genre in music are in many ways similar to mine