28402
She later became musical director , touring with them for four years and working with composers including Leonard Bernstein , Virgil Thomson , Aaron Copland and Marc Blitzstein .
 Leonard Bernstein, Virgil Thomson, Aaron Copland, Marc Blitzstein
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:
 Leonard Bernstein, Virgil Thomson, Aaron Copland, Marc Blitzstein