Personnel Manager's Reports, Season 1949-50; Weekly listing of men who missed rehearsals and/or concerts due to illness, bereavement, etc.; List of extra musicians; problems with behavior of individual orchestra members; musicians missing rehearsals and concerts due to illness; letters from doctors treating ill musicians; list of orchestra personnel for the season; out-of-town concerts; Extended absence of violist Giovanni Imparato; large number of extra musicians required for Strauss' "Elektra" (Mitropoulos), Mahler Symphony No. 1 (Walter), Respighi "Pines of Rome" (De Sabata), Wagner excerpts (De Sabata), Mahler Symphony No. 8 (Stokowski), Strauss' 'Sinfonia Domestica" (Mitropoulos); recordings