13736
As  Jackson  's voice matured  Motown  found it difficult to find material to suit Jackson who had sung in a higher voice for most of the duration of his Motown ( 1969-1975 ) tenure .
 employee of: Jackson, Motown
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: Jackson, Motown