"The term Columbia Symphony Orchestra was also used when, for contractual reasons, another orchestra could not appear under its own name. Many Los Angeles Philharmonic musicians also played with the Columbia Symphony, and some reports mention that the entire (New York) Philharmonic frequently played as the Columbia Symphony."
"Leonard Bernstein (pianist & conductor) and the "Columbia Symphony Orchestra" (which is actually New York Philharmonic Orchestra as CBS had to use the alias due to contractual requirements) in 1959...."
The Columbia Symphony Orchestra was an orchestra formed by Columbia Records strictly for the purpose of making recordings. It provided a vehicle for some of Columbia's better known conductors and recording artists to record using only company resources. The musicians in the orchestra were contracted as needed for individual sessions and consisted of free-lance artists and members of either the New York Philharmonic or the Los Angeles Philharmonic, depending on whether the recording was being made in Columbia's East Coast or West Coast studios.