Philharmonic-Symphony Orchestra Of New York

Up to 1928, the two New York orchestras New York Philharmonic Orchestra and New York Symphony Orchestra were operating independently.
In 1928, they merged and took the new name: Philharmonic-Symphony Orchestra Of New York (P-SONY).

The first and last concert under P-SONY was on October 4, 1928 and on May 12, 1957 respectively.
After this date, the orchestra made an intentional name change into New York Philharmonic (NYP).
The first concert as NYP was on October 12, 1957, coinciding with Leonard Bernstein becoming conductor.

For recordings from the P-SONY era, but issued later with NYP as artist: just credit NYP with ANV "as on release" if necessary - no need to credit P-SONY.
The legal entity behind the orchestra is called The Philharmonic-Symphony Society Of New York, Inc.. Use this credit for label and company roles.