Sundaram, Katyayani and a group are chanting: Namastasyai Namo Namah. You can find this kirtan in the Yoga Vidya kirtanbook as No. 691 - just part of the refrain of the Devi Mahatmyam hymn:
Namas Tasyai Namas Tasyai
Namas Tasyai Namo Namah
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