4397
He was asked by Keith Richards and Brian Jones to be the lead singer of a group they were forming , but he turned them down .
 person: Keith Richards; person: Brian Jones
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Keith Richards; person: Brian Jones