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It was originally part of the incidental music he composed for his brother-in-law Arvid Järnefelt 's 1903 play Kuolema ( Death ) , but is far better known as a separate concert piece .
 Arvid Järnefelt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Arvid Järnefelt