In September , 1950 he returned to Berlin for the first time since the aborted concert of 1933 ; he conducted the Berlin Philharmonic in a program of Beethoven , Mozart , Richard Strauss , and Brahms , and `` gave a lecture for the students of the Municipal Conservatory - formerly his old school , the Stern Conservatory - at the students ' request '' His late life was marked by stereo recordings with the Columbia Symphony Orchestra , an ensemble of professional musicians assembled by Columbia Records for recordings .
In his later life he made many stereo recordings with the Columbia Symphony Orchestra .