Coming from a musicians background (particularly guitar), most of my references will be in that regard but obviously still the same concept (gear techniques). If you’re referring to “new techniques” around using synthesizers, I may not be as familiar in the last year or so but I’ll start with what I know over the last 10:
(Also don’t mean any offense by my earlier comment, just recognizing creativity is evolving all around us & at rates higher than previous era)
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Live looping / beatboxing / sampling -
Obviously the sampling renaissance took off in the 90’s techno era (reaching it’s peak with Daft Punk’s Discovery album) but since then gear has allowed this to get pushed further into drafting these types of songs live.
Two great examples of this would be Reggie Watts & beardyman, both taking live sampling & song creation to pretty intense levels. Not saying they’re the first to do it but both have made careers out of getting on stage with numerous pieces of gear and using them in interesting ways to create songs out of thin air (very little pre-prepped sets). I’m sure there are more examples than those that I gave and probably some pre-dating mine (educate me?) but those two definitely have had sets that I’ve watched that have expanded how I look at my gear / setup / creative workflow and realized that I shouldn’t feel so restricted / forced into a certain path and more free to just create my own.
This concept has been expounded upon by Marc Rebillet in the last few years (less than 5?) as he has become a pretty known phenomenon taking live-sampling / beat creation but combining it with humor / meme-worthy content that people enjoy seeing live. Obviously he is very technically & musically talented but his gimmick is what seems to keep people hooked.
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Guitar techniques -
Obviously techniques with stringed instruments have ever evolved since the first lutenists had to play / sing for their lives in the royal court. But in more recent years there’s been a lot of cool developments.
First I would point it is the very obvious Candyrat records. If you’re not familiar, Andy McKee really took the guitar and (obviously not the first to do it) expanded upon the popularity of the guitar as a percussive instrument to help flesh out the full range of sounds you could get from it. Entire songs are crafted with beats interwoven into the riffs when previously this was used as novelty at best? Other artists have (like Jon Gomm, highly recommend the song Passionflower) have taken these techniques to quite extremes and I’d find it hard to say that 10-15 years ago musicians were playing guitars / stringed instruments in similar capacity. And if they were, it certainly isn’t as mainstream as it is today.
Next I would point to the very popular genre of djent metal, where percussion has again pervaded the stringed instrument. Obviously most guitarists become very talented by combining multiple techniques learned from previously eras of guitarist (Satriana, SRV, Hendrix, Zappa) but it does start to become it’s own life. Djent has adapted new picking techniques (using the thumb similar to a bassist) and rhythmic intervals which were maybe discovered previously but not mastered or as prominent as they are today.
Other artists playing their stringed instruments in new capacities that I would recommend would be the likes of Charles Caswell or Lucas Mann. May not be a style that everyone loves (you can tell these guys grew up on midi tracks playing during their favorite video games in the 90s/00s etc.) but between some of the sweep tapping, kill-switch & tremolo combinations…at what point do you say that all these separate techniques combine to something larger than the sum of it’s parts? These artists may not be doing something entirely new but their technique isn’t the norm when you think of a guitarist, metal genre or not.
I’d also recommend the likes of Plini, Chon, Polyphia, Owane, etc. taking rock into interesting direction in the last 5 years.
But we’re discussing something very subjective at it’s core so who is to say? I just know that I find artists evolving & attempting new technique (for better or worse) in their musical endeavors and no day do I sit down and truly believe we are in an era of stagnation. I feel that, with more music options than ever, people are that much more free to find the sound that defines them & to continue pushing the envelope for musicality that may not have existed a minute, a day, a year, or a decade prior.
Cheers