The tradition of classical music and the opera is such that it used to be the place where social intercourse could take place between all parts of society: politicians, industrialists, artists, citizens, etc. That tradition, I think, still exists, but it's much, much more diluted.
Yo-Yo MaPracticing is not only playing your instrument, either by yourself or rehearsing with others - it also includes imagining yourself practicing. Your brain forms the same neural connections and muscle memory whether you are imagining the task or actually doing it.
Yo-Yo MaMusic has always been transnational; people pick up whatever interests them, and certainly a lot of classical music has absorbed influences from all over the world.
Yo-Yo Ma