Hi Hal. I thought I was being clear in my two previous posts. I'm copying a couple of sections, since you ask (and I don't want to assume, in any way) [repeat, I don't want to assume]. Best, - David.
From Wikipedia: "Timing in music refers to the ability to "keep time" accurately and to synchronise to an ensemble,[1] as well as to expressive timing—subtle adjustment of note or beat duration, or of tempo, for aesthetic effect.
Research in music cognition has shown that time as a subjective structuring of events in music differs from the concept of time in physics.[2] Listeners to music do not perceive rhythm on a continuous scale, but recognise rhythmic categories that function as a reference relative to which the deviations in timing can be appreciated.[3][4] In fact temporal patterns in music combine two different time scales—rhythmic durations such as half and quarter notes on the one hand, and on the other, the continuous timing variations that characterize an expressive musical performance."
From:
https://www.musical-u.com/learn/how-to-improve-your-rhythm-and-timing/"Having a reliable sense of rhythm is a hallmark of any good musician and it’s one of the things which can immediately distinguish an amateur from a pro.
HIGHLIGHTING >>>: Our sensitivity to rhythm when listening to music is subtle but powerful, and any inaccuracies quickly give the listener and uneasy sense that things aren’t working quite right.
In music rhythm is widely considered as the regulated succession of strong and weak elements, or of opposite or different conditions, whereas “timing” refers to the ability to keep accurately to the regular beat and synchronize with an ensemble. With such a fundamental and broad definition, hopefully you can see why having a strong sense of rhythm isn’t just for the drummers!"