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Books about Nagarathnamma:
The Devadasi and the Saint: The life and times of Bangalore Nagarathnamma by V Sriram (Dec 1, 2007)
Wiki information Nagarathnamma:
Bangalore Nagarathnamma was an Indian Carnatic singer and cultural activist who started the Tyagaraja Aradhana festival in memory of Carnatic singer Tyagaraja at Thiruvaiyaru.
R Nagarathnamma is an actor.