50457
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: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Philadelphia Orchestra, Leopold Stokowski