4256
He has performed and recorded with such artists as Roy Orbison , Elvis Presley , Emmylou Harris , John Denver , and Ricky Nelson .
 person: Roy Orbison; person: Elvis Presley; person: Emmylou Harris; person: John Denver; person: Ricky Nelson
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: Roy Orbison; person: Elvis Presley; person: Emmylou Harris; person: John Denver; person: Ricky Nelson