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In 1955 , the song , a 12-bar blues , peaked at number five on the " Billboard " pop chart and was number one on the R&B chart .
 media: Billboard
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:
 media: Billboard