More than Winckelmann, the most egregious mistake was made 200/300 years earlier, when Popes like Julius II, artists like Michelangelo, Brunelleschi, Vasari, Bramante, and all the others began to "unearth" our past, a past that then became Italy's greatest responsibility for ancient art (and not only). If Michelangelo hadn’t believed that ancient statues could NOT be white, that those few monuments of ancient Rome that were unearthed, cleaned, and reevaluated during the Renaissance... things would have gone differently.
Although I must say that Buonarroti, when he slipped into Nero's "domus aurea," had his suspicions. But the Pope stopped him. Because for a white Westerner, it is synonymous with purity, whiteness, and innocence. And showing naked white and colored bodies is quite different. For the same reason, we had to wait until 1977 to have color TV... Because the Vatican did NOT want it... And did everything to prevent it.
Returning to music, I repeat: today we NO longer have the "biological" tools to understand it.
Conversely, and paradoxically, if a hypothetical spectator from the 1700s were to listen to a representation of music today, not just classical, they would find it an unbearable disgrace. Even a Hi-Fi system worth thousands of euros wouldn’t evoke any special emotions for them... Hearing is changing.... and the fact that 90% of people listen to MP3s on an iPod and live happily shows this.... and very few invest thousands of euros in Hi-Fi systems... Because they would perceive very few differences. This is why SACD, for example, has failed. Acoustic compression and editing arise precisely from this need. To compensate for physical shortcomings that didn’t exist 100 years ago. And anyway, taste changes....
Stepping out of classical, try listening to a jazz quartet from the Armstrong era of the 1920s.... aside from the style, without amplification, with primordial drums made of tin, instruments not always up to par (saxophones, pianos, and so on). Today it would be unthinkable.... And if you go to a jazz concert, there are dynamics and chromatics that would have been unthinkable in the 1920s.... Beyond the style, I repeat, deeply changed after the "Be-Bop" revolution of the 1940s/50s...
Best regards.