Two primary live experiences are what come to mind.
First, a group playing purely acoustic instruments in an open field away from any reflective structure to appreciate sonic purity. Music organically evolved outside for public enjoyment without any sort of mechanical or electrical contrivance. Even the best concert halls are intended to homogenize and smear out the sound to cover the maximum number of seats the structure is designed for so every paying butt filling those seats hears their money's worth. Concert halls are simply mechanical PA stacks. Outside of any structure, the purity of the music can finally be fully appreciated for what it is intended to be without alteration.
Secondly, a lone musician or, preferably, singer in a private performance to appreciate the immediacy and emotional impact of music in an intimate setting. Music for a private setting is intended to be more emotionally charged and presented with far different sonics than most of us came to expect from the "audiophile" biases gained through this hobby.
These two experiences do far more to reset false biases of what music should sound like than any amount of solitary listening to equipment regardless of the thousands of hours spent filling a seat. They help to remind the listener of what real instruments are supposed to sound like when played together and the immediacy of one playing for one. It's hard to go back to the audiophile listening for echoes in the background of a recording made in an empty room, euphonic midbass bloom from some particular component, or the pin point, but 2D presentation of a minimonitor as being remotely connected to what music truly is supposed to be in its most natural forms.
