If you are chasing the quality of the studio sound the recording artists settled on, then you need that studio and system. If you are chasing the quality of a live PA performance then you need an impeccable soundboard recording and that PA. If you are chasing the quality of an acoustic performance, good luck! In that case it isn’t clear that the most accurate system is the solution given human psychophysics. Do you want to listen to the recording or the music?

This. That was only for double-sided military earplugs before 2015. Those could become slightly dislodged and have decreased protection. Their foam ones now are as good as any other foam ones, which is pretty good.

Westerners are posers compared to Japanese audiophiles.