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Katsionis would later handle guitar duties as well and both himself and Cross would later go on to perform with Greek power metal outfit  Firewind  ( the main band of guitarist  Gus G  who became Ozzy Osbourne guitarist in 2010 ) .
 employee of: Firewind, Gus G
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:
 employee of: Firewind, Gus G