1690
After two years and a string of short-lived vocalists , Norma Zimmer was hired , starting in 1960 .
 person: Norma Zimmer
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Norma Zimmer