Which widely acclaimed singer on the soundtrack of Ramu defined feminism in South Indian Cinema?
Ramu (1968 film):  The soundtrack of the film was composed by R. Goverdhanam and songs rendered by Ghantasala Venkateswara Rao and P. Susheela, most memorable one "Raa Raa Krishnayya". P. Susheela:  Susheela is widely acclaimed as a singer who defined feminism in South Indian Cinema and is well known for her mellifluous vocal performances for over 40,000 film songs across South Indian languages.
P. Susheela