In listening to your system(s)...what is most crucial to your enjoyment?


In growing up around live musicians and instruments, the authenticity of sound, timbre ( Timbre is French in origin, which is apparent in its pronunciation: it is often pronounced \TAM-ber\ and, with a more French-influenced second syllable, \TAM-bruh\. ... And timbre may also be correctly pronounced just like timber as \TIM-ber\) ...a search finds diversity to the definition of timbre.  For me, it ties to "my truth" when I hear non-amplified instrument or group of instruments, voice or voices presented before me.  Changes to my system either get me closer or further from my truth.  Emphasis "my truth" because I've come to believe, like our other senses, it differs among us, leaving "experts" to theirs, some of which seem to "fit" mine.  It's fun when that happens.  Robert E Greene of TAS and Art Dudley of Phile seem to have advised me towards my truth over the years (with bits of disagreement here and there) but, they have steered me well, thanks.  What do you find crucial?
pinthrift
pinthrift

Dynamics (macro/micro), Texture and Timbre,  are important to my ears.
Specifically, a Jazz drummer 's use of brushes on the skins.

Happy Listening!
The quality of the recorded music...composition, performance, sound quality.  Is it interesting?  Is it emotionally engaging?  Is it well executed? Wish I could do a better job defining the characteristics that draw me back repeatedly to certain music.  Regarding sound quality of the recording: clarity/lack of noise/distortion, stage depth and width, imaging and image density, frequency range and dynamics (and that order should not be taken to indicate any sort of prioritization).  The music itself (composition, performance and sound quality) is the 800 pound gorilla in the room that doesn't get enough discussion.  A good recording can make a mediocre system sound great.  A poor recording can make a great system sound mediocre.   
Imaging,bass detail,soundstage.impact ,highs,midrange and great bass are all important to me.My system does it all exemplary.
Hey Folks.  Thought I'd catch us up a bit.  This was my first attempt posting a topic, and missed a bit of clarity in the goal.  Thanks to those sharing so far!  Rephrased, "In improving the sound of your system, define the one thing stands out as the most vital to your progress?"  Spearheaded by the thick little audio journals of the late 70's, Harry Pearson and J Gordon Holt gave voice to hi-fi.  We've become quite skilled in the language of sound; in defining macros & micros, stage presentations in halls and the nuances of studio production..."inter-transient silence" is a fine example from above. 
In "the chase," my personal niche is obtaining the gear best I can afford, then going to work improving upon it.  Removing harmful resonances both of cabinetry and under the hood of all my gear has lifted the resolution to incredible heights over the years.  The trick is, keeping all that imagery musical, and in place.  Here, latest upgrades have been in the electrical realm, further refining my 10ga dedicated line with new outlet/cover and hard wired male plugs.  So far, results are more than the leading edge transients, and/or decay, or "air around the instruments," more than "flow," "organic," "ease," "Sheffields"  --Thelma Houston's, "I've Got the Music in Me," circa 1975 was my first, btw.--  It is, of course, the sum of all that...yet, timbre is what hits me first and strongest...my truth.  Onward!  Pin
 " a good recording can make a mediocre system sound great "

No way it can.