Question: Which widely acclaimed singer on the soundtrack of Ramu defined feminism in South Indian Cinema?

Context paragraphs:
Brahmanandam: Brahmanandam Kanneganti (born 1 February 1956) is an Indian film actor and comedian, known for his works predominantly in Telugu cinema.  He currently holds the Guinness World Record for the most screen credits for a living actor.  He was honoured with the Padma Shri, for his contribution to Indian cinema in 2009.  Brahmanandam is regarded as one of the finest comic actors of India, noted particularly for his comic expressions.  He has acted in more than 1100 films till date and has been one of the highest paid comedy actors in Indian Cinema.  Brahmanandam has garnered five state Nandi Awards, one Filmfare Award South, six CineMAA Awards, and three South Indian International Movie Awards for best comedy.  Race Gurram (2014) was his 987th film.

Bhanumathi Ramakrishna: Paluvayi Bhanumathi (7 September 1925 – 24 December 2005) was a multilingual Indian film actress, director, music director, singer, producer, book writer and songwriter.  Widely known as the first female super star of Telugu cinema and South Indian film Industry, she is also known for her works in Tamil cinema.  She was awarded the Padma Bhushan in 2003 for her contribution in Indian cinema.  She was honored among "women in cinema" at the 30th International Film Festival of India.

K. R. Vijaya: K. R. Vijaya is an Indian actress who has starred in Tamil, Malayalam, Telugu and Kannada films.  She started her career in the 1960s.  She has been acting for more than four decades now in South Indian cinema.  K. R. Vijaya has worked with almost all the stalwarts of South Indian cinema and has played a variety of roles.  She had acted in more than 320 films in Tamil, Malayalam, Telugu and Kannada.

Ramu (1968 film): Ramu is a 1968 Telugu-language drama film produced by AVM Productions and directed by A. C. Tirulokchandar.  The film stars NTR and Jamuna in the lead roles.  It is a remake of the 1966 Tamil film of the same name starring Gemini Ganesan, K. R. Vijaya and Pushpalatha which itself was a remake of the Hindi film "Door Gagan Ki Chhaon Mein" (1964).  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: Pulapaka Susheela, commonly known as P. Susheela, is an Indian playback singer associated with the South Indian cinema for over six decades.  She has been recognized by both the "Guinness Book of World Records" and the "Asia Book of Records" for singing most number of songs in Indian languages.  She is also the recipient of five National Film Award for Best Female Playback Singer and numerous state awards.  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.

List of Kannada songs recorded by K. S. Chithra: K. S. Chithra (born 27 July 1963) is an Indian playback singer.  She sings in Malayalam, Tamil, Telugu, Kannada, Hindi, Assamese, Bengali, Gujarati, Marathi, Nepali, Oriya, Punjabi, Tulu and other languages.  Chithra's career began after she teamed up with music director M. G. Radhakrishnan in 1979 and sang few songs for him in Malayalam cinema.  In 1985, after she was widely acclaimed for her rendition in the Tamil film "Sindhu Bhairavi" composed by Ilaiyaraaja, she began to get offers from all the South Indian film industries.

R. Nagendra Rao: Rattihalli Nagendra Rao (23 June 1896 – 9 February 1977) was an Indian theatre actor, film actor and director in South Indian cinema.  After a career in theatre, Rao's career in films was those of an actor, director, producer, screenwriter and an occasional composer.  He is considered one of the most influential personalities in the history of South Indian cinema.

Ilaiyaraaja: Ilaiyaraaja (born 2 June 1943 as Gnanathesikan) is an Indian film composer who works in the South Indian cinema predominantly in Tamil since mid 1970s.  Widely regarded as the greatest Indian music composer of all time, Ilaiyaraaja is also an instrumentalist, conductor, singer, and songwriter.  He has composed more than 6000 songs and provided film scores for more than 1000 films, particularly being acclaimed for his background scores.

Rajkumar (actor): Singanalluru Puttaswamayya Muthuraju (24 April 1929 – 12 April 2006), known mononymously by his stage name Rajkumar, was an Indian actor and singer in the Kannada cinema.  Widely acclaimed as one of the finest actors in the history of Indian Cinema, he is considered a cultural icon, and holds a matinée idol status in the Kannada diaspora, among who, he is popularly adulated as "Nata Saarvabhouma" (Emperor of Actors), "Bangarada Manushya" (Man of Gold), "Vara Nata" (Gifted Actor) and "Rajanna" (Brother Raj).

List of South Indian film families: There have been several families who have had three or more members have been involved in South Indian cinema in a variety of professions related to the industry.  For actors who featured in predominantly Hindi films rather than South Indian films (i.e. Aishwarya Rai or Kajol; see List of Hindi film clans).  Below is an incomplete list of families that have been involved in South Indian cinema.

Supporting paragraphs: Ramu (1968 film) P. Susheela
Answer: P. Susheela