To a lesser extent all music requires this synchronization but vocalization is so fundamental that it involves most of the brain. All must be in sync with the composer/arranger (Brava, Alice Parker) even if not physically present.
Every good chorus I have sung with, and there have been many, has been an extremely tight social group where all members have liked and respected each other. Years later they can reunite either individually or as a group and it as if no time has passed. The few outliers don't tend to last long no matter how well they sing.