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During the prolific last decade of his life he also wrote a concerto for violin and orchestra ( 19771978 , revised version 1980 ) written for the violinist Ida Haendel , a sixteenth symphony ( 1979 ) which features a bravura solo part for alto saxophone commissioned by Frederick L. Hemke , and an incomplete , posthumously discovered concerto for viola and orchestra ( 19791980 ) .
 Ida Haendel, Frederick L. Hemke
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:
 Ida Haendel, Frederick L. Hemke