The competition begins at about 1:35, after they’ve had some words. The song is “Aaye Haaye Dilruba.” Geeta Dutt sings for Helen, Asha Bhosle for Vyjayanthimala; music by S.D. Burman.
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P.S. Helen is great to watch in this, but she pretty clearly gets clobbered at the end.
Thanks for this nice post. A detailed blog on songs of Helen is here
http://www.geetadutt.com/blog/?p=183
and
http://www.geetadutt.com/blog/?p=151
Best Regards