1790
Clapton  brought guitar-led blues influences to the forefront of the group ; he had left  The Yardbirds  in order to concentrate on the blues .
 employee of: Clapton, The Yardbirds
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: Clapton, The Yardbirds