Specific musical elements and production techniques got mentioned several times in this thread. But I always suspect they’re just symptoms.
There’s an interesting quote from a recent article on Mixmag (if I’m not mistaken) about the decline of underground in China, but could also apply anywhere. It says more or less, “the underground isn’t cool, people see them as an outcast, rejected from the scene”.
It was the more commercial stuff that got me into trance, until I learned the underground got a cooler factor: it was an act (or art) of rebelion. In contrast, common people see them as geeky/weird music instead of rebel music. I remember giving my friend a listen to West on 27th and Sacred Cycle (Quivver Remix). He said, “weird music, how do you find these repetitive drums and pipe/water drop sfx exciting?”. But that’s how I see the notion of the underground. The more serious, the weirder, the cooler it is. And that drives the genre to keep on exploring.
But back in the days the world was in peaceful, post-cold war era. So being a rebel was cool. While today, we live in chaotic world and people crave for certainty from what’s familiar. This could be the reason why commercial pop-ish EDM wins the masses, the what-used-to-be underground are getting similar one to another, and why me (maybe you too) prefers music with qualities of the past. The ones we feel at home, and the ones we’re more familiar with.
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On the other hand, artist/talent management also gives producers release targets on quantity. It's becoming a numbers game, no longer about the art. The music should be able to created and recreated in x amount of time, giving a way for templates and fabricated loops/presets to take over. When they're experimenting, it just sounds half arsed. All just to meet the target and the business going.
Just my 2c