9791
After spending many years writing and performing in relative obscurity in London , he has recently begun collaborating with some of the biggest superstars in the music business .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None