Our next performance – of two major choral works for unaccompanied choir – commemorates the 150th anniversaries, to within a few days of the actual dates, of the births of composers Sergei Vasilyevich Rachmaninov (1 April 1873 – 28 March 1943) and Johann Baptist Joseph Maximilian Reger (19 March 1873 – 11 May 1916)....