To close the seventy-fifth season, Carlos Kalmar and the GPO take back the outdoors and are joined by Christopher Bell’s vastly under-appreciated Grant Park Chorus and soprano Amber Wagner, mezzo-soprano Kathryn Leemhuis, tenor John McVeigh and bass Jason Grant in the monumental Beethoven Ninth Symphony. Those quiet sections will give traffic a chance to compete but by the time of the glorious finale, street noise won’t have a prayer against all of those forces blaring away and singing out about the brotherhood of man.