Do we really know what "Live" music sounds like?

If I’m not mistaken, amplifiers are part of every non-acoustic instrument. With a great deal of effort, I’ve learned to appreciate opera; but the amplified human voice is to me, far more listenable in any venue larger than a coffee house.

That said, I think it’s impossible to know what live music sounds like until/unless you actually hear it, simply because no listening room's acoustics approximates those of the broad range of acoustic environments in which one hears live music. Nevertheless, psycho-acoustic phenomena more than adequately compensates for that deficit . . . provided the playback system is linear in all respects and capable of reproducing the frequency extremes included in all live music.

My preference is two-channel analogue for the ultrasonic frequencies that convey the emotion and sound staging the performers and recording engineers intended their listeners to experience. I prefer valve amplification on accounta' it augments my GFA heating system at my sedentary listening position enough to keep me comfortable during cold winter months.

Besides, tube rolling is kinda’ fun.😀

At least with live music one will not encounter 'sibilance' with vocals. But back in the days of 70's live Rock gigs the sound was so awful that I remember suffering from sound buzzing in my ears for a long time after the concert.  Especially the time when I was directly positioned on the side where Ritchie Blackmore's guitar came out of the huge concert speaker, it was good to know the tunes of the songs played in advance because one would not recognise the song actually played live in concert because of the distortion of the loud sound.....!

Coming back to the op’s statement I often find that so called ’live music’ via HiFi System would sound better than the ’studio’ version, because it has the advantage of sounding organic with verve. Sometimes listening to sealed speakers in comparison to ported speakers has the same effect which makes the music more ’immediate’ one of the treasure of the ATC speakers and highlights more how the musicians are playing their instruments. Groups such as Pink Floyd and Dire Straits have done studio and live albums of their same tracks, often the way the tracks have been performed are nearly  identical in Studio mode or Live mode but the sound effect of the ’Live’ mode for me is the instant obvious advantage of that live instant and immediate sound.....

As virtually all the concerts I attend are unamplified classical concerts (orchestral, chamber choral, organ and piano recitals) or small acoustic ensembles (folk), and playing guitar and singing in choirs myself, I'd say I know what live music sounds like.  I don't know what classical concerts Roger is attending, but rarely do I see the use of sound reinforcement in a concert hall other than for Broadway shows.  

     A little something, of which most are unaware, regarding some of those, "...unamplified Classical concerts...", here:

                  https://www.orchestra-innovation.org/osires