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He eventually paired with Leonard Bernstein , with whom he collaborated for a short time on a sacred mass ( he eventually withdrew from the project , " finding it perhaps too far afield from his comfort zone " ) .
 person: Leonard Bernstein
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Leonard Bernstein