I doubt that listening to complex music will affect intelligence. Perhaps it will only develop an auditory attention to detail. But if you start playing music by notes on any instrument, it will undoubtedly develop your brain very much. Especially if you play complex music. Playing with notes is like reading a foreign book, where there are no repeating words. And at the same time, correctly play notes and chords with both hands. This, of course, will have a very beneficial effect on intellectual abilities.
And besides, this is a useful skill.
It's like asking "will you be smart if you put on glasses". Of course not. You need at least a subtle perception in order to see, analyze and explain both the whole picture as a whole, and each separate area. And to dig "in all sorts of points and sticks", most of the desire will not appear. In general, musical preferences are a consequence, but not a cause. People choose what to listen to. More precisely, not quite themselves and not quite choosing, in general, my idea succeeded best of all here.
However, if a person already has a very good tendency to develop, then such music can help a little to develop the subtlety of perception. True, for this you need to know a lot of terminology. But if a person is already a completely full tree, then this will not help at all: maybe for a couple of seconds he will pretend to be something, but in reality he will not take anything for himself. As they say, one born to crawl cannot fly.
It seems to me that aesthetic qualities and intellectual development are quite closely related. But it all depends on the listener, as was noted by the previous author, because you can endlessly listen to music "half-heartedly", or you can take a long time and in detail to disassemble each passage from the work, and each time find something new in it. From personal experience I will say what influenced my development)
In fact, everything is purely individual. Many factors influence the effect of music on the human psyche, be it musical taste, mood, environment, etc. But if you take it as a whole, summarizing, then I can advise you this article lpgenerator.ru. Everything is clearly and interestingly described in it, there are pictures :)