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In 1949 , he became first trumpet with the MGM film studio orchestra , playing on all the major MGM soundtracks from the Golden Age of Hollywood including An American in Paris , Singin ' in the Rain , Gigi , West Side Story ( at United Artists ) , My Fair Lady ( at Warner Bros. ) , Two for the Seesaw and Bye Bye Birdie ( at Columbia Pictures ) , along with many others .
 MGM, MGM
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 MGM, MGM