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In 1965 , folk-rock singer Donovan 's cover of Buffy Sainte-Marie 's " Universal Soldier " was a hit on the charts .
 Donovan, Buffy Sainte-Marie, Universal Soldier
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:
 Donovan, Buffy Sainte-Marie, Universal Soldier