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One show while Breuer was singing the classic Judas Priest song Devil's Child  Rob Halford  The Metal God  singer  of Judas Priest entered the studio still with his coat on and sang with him.YouTube Breuer and Halford Duet He appeared on The Howard Stern Show on August 19 2010 as Joe Pesci for the entirety of the show with the exception of the news .
 title of person: Rob Halford, singer
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 title of person: Rob Halford, singer