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In 1931 and 1932 , experimental high fidelity , long playing , and even stereophonic recordings were made by the labs of the Philadelphia Orchestra , conducted by Leopold Stokowski .
 Philadelphia Orchestra, Leopold Stokowski
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Philadelphia Orchestra, Leopold Stokowski