John van Rhein has some very definite opinions on the subject whom the Chicago Symphony ought to select for its next music director. “Audience numbers have fallen during the Barenboim years, internal morale has sunk and the orchestra remains an orphan of the airwaves and recording studio. The CSO badly needs a music director who can restore the orchestra’s luster in these and other areas. The eyes of the music world are upon Chicago.” Chief among van Rhein’s criteria: the new guy needs to be an American.