7389
In 1929  Walker  made his recording debut with a single for  Columbia  Records Wichita Falls Blues / Trinity River Blues billed as Oak Cliff T-Bone .
 employee of: Walker, Columbia
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Walker, Columbia 
Answer:
 employee of: Walker, Columbia