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He took part in one of the earliest hard bop sessions , alongside Art Blakey , Horace Silver , Doug Watkins and trumpeter Kenny Dorham .
 person: Art Blakey; person: Horace Silver; person: Doug Watkins; person: Kenny Dorham
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: Art Blakey; person: Horace Silver; person: Doug Watkins; person: Kenny Dorham