There are so many instances of this it doesn't need explaining. Many examples seem regrettable at least to someone.
For musicians to be able to co-produce the event of a session or recording they need to share sufficient understanding of the principles of rhythm, tone or pitch in their given musical culture that they can harmonise to each other.
This doesn't always happen right away, as this video shows: even extraordinary musicians have to figure each other out, within the constraints of whatever they have decided to try to make happen together, using whatever capacity and reputation and prior relationship they each bring to the moment.
This raises the question: how much shared language is sufficient even to begin? And then, on what basis is it possible to continue?
(Testing video embedding here.)
YOUTUBE xIYtlzAJUcg (double-click to edit caption)