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Nkabinde himself joined the kwela group Alexandra Black Mambazo ( from which the Ladysmith choir would later take its name ) , among the members his older brother Zeph and Aaron ' Big Voice Jack ' Lerole , the originator of the singing style later known as " groaning " .
 Alexandra
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alexandra