It's not a single component. It takes a whole system (and detailed setup) to be able to naturally render fine detail. There's also a school of thought that argues that the type of detail you use as examples are more an artifact of the close microphone recording process than what anyone would hear from live instruments in a performance hall.
Midrange texture?
I'm curious what part of the audio system defines the midrange texture and detail of the sound. For example when listening to violin or cello, in some system you hear more of the vibration of the wood and resin in the bow. Also for the saxophone, in some system you hear the vibrating reed in addition to the sound of horn.