Dear
@Sirona
It is nice to see you are open about this. These things are not set in stone and there is a fine line.
With sharing a mantra comes responsibility. Especially the beej (seed) mantras (hreem , klim, haum etc.) and the heavy Devi mantras full of beej are recommended to be taken up after properly studying their meaning from an authentic source, IF that is a suitable mantra for that living entity, since it will make a difference to their consciousness.
Nowadays , internet can do that to a certain extent, but care has to be taken.
However, turning it into "fusion music" etc. is taking things far IMHO.
Just take this one -- you could not even hear the mantra clearly at first glance.
Is that guarding Devi's and the mantra's honor ? To me it is treating the mantra casually.
This kind of music does not sound sAttvik enough for a mantra.
"Of Vedas I am SAma" says Krishna in VibhUti Yoga , BG Chap 10. SAma introduced the swar, musical notes, and laid foundation for divine classical music. Music is an expression which can be sAttvic, RAjasik or TAmasic - hence affects consciousness.
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It was Ramanuja's "adhikAr" because he had earned it, was an "adhikAri" person of God, and distributed the simple ashTAkshari (8-syllabled) mantra to call NArAyaNa. (AdhikAri = with a certain spiritual standing and responsibility).
Chatanya Mahaprabhu was compassionate too, like Ramanuja -- but went one step further: He reversed the 16-word mantra in Kali Santarana Upanishad that Lord BrahmA told DevaRshi NArad, from "Hare Ram Hare Ram ..." first to "Hare Krishna " first. This way it is no longer a Vaidic mantra and you can sing, dance with it and sky is the limit.
Actually in those days, they sang bhajans and called out to Hari spontaneously as they wished (e.g. He taught his friends -- Hari HarAya nam,ah: KrishNa yAdavAya namah: ...) .
Chaitanya Mahaprabhu did not perform the Hare Krishna kirtan like the modern day GauDiya VaishNavs do - where the only words are Hari, Ram and Krishna (and they interpret Hare as vocative of HarA instead of vocative of Hari) .
Rather, it was more lose flowing bhajan that brought "Krishna- bhAvAmRut" into people's consciousness.
However, that kind of bhajan is culturally absorbed or picked up, whereas a standard set of words is easier to teach universally across cultures when uniformity is emphasized - especially applies to a preaching organization.