1749
As a psychedelic band led by Syd Barrett in the late 1960s Pink Floyd had moderate mainstream success and were one of the most popular bands in the London underground music scene ; however  Barrett  's erratic behaviour eventually forced his colleagues to replace him with guitarist and singer  David Gilmour  .
 None
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:
 NA: Barrett, David Gilmour