“Artistic administrator” is not exactly a glamorous title, but most major orchestras would have trouble functioning without one. So it was a notable event this week when three of the top US orchestras announced what amounted to an administrative carousel. “Chad Smith, the artistic administrator of the New York Philharmonic, will become vice president for artistic planning of the Los Angeles Philharmonic… Matías Tarnopolsky, currently senior director of artistic planning at the Chicago Symphony, will replace Smith in New York. Smith returns to the L.A. Philharmonic less than a year after he left the orchestra for New York.”