Question: What singer, with the birthname Ashutosh Ganguly Bengali, performed songs for the movie Polam Pol ?

Context paragraphs:
Dhumketu (2017 film): Dhumketu (The Comet) is an upcoming Bengali romance action movie which will release in December, 2017 under direction of Koushik Ganguly The film produced by Dev Entertainment Ventures features Dev, Subhasree Ganguly and Chiranjeet Chakraborty in lead roles.  Initially the shot completed in the locations of Kolkata before the unit moved on to Khoorpatal, Nainital.  The unit was at first supposed to shoot in Kashmir but later Nainital was selected.

Roopa Ganguly: Roopa (or Rupa) Ganguly (Bengali: রূপা গঙ্গোপাধ্যায়, rupa gônggopaddhae ; born 25 November 1966) is an Indian actress, playback singer and politician.  She is one of the most popuplar faces of Indian television and mostly known her rendition of Draupadi in B R Chopra's hit television series "Mahabharat" (1988).  A veteran of Bengali Parallel Cinema, she is known and for her versatility as well as keen and incisive transformation into characters.  She has worked with renowned directors like Mrinal Sen, Aparna Sen, Goutam Ghose and Rituparno Ghosh.  She won many awards including a National Award.  She has been cited as the Bengali Film Industry's answer to Bollywood's Shabana Azmi for her intense ability of acting.  She is a trained Rabindra Sangeet vocalist and a classical dancer.  In October, 2015, she was nominated as the Member of Parliament, Rajya Sabha, by the President of India.  She served as the President of BJP Mahila Morcha in West Bengal.  She served as the General Secretary and the Vice President for the West Bengal Motion Picture Artistes' Forum, a body representing cine artistes.

Romeo (2011 film): Romeo is a romantic Bengali film directed by Sujit Mondol and starring Dev and Subhashree Ganguly in lead roles with Sabyasachi Chakrabarty, Laboni Sarkar, Koushik Banerjee in supporting roles, whilst the music was scored by critically acclaimed Jeet Ganguly.  The film was released on 4 November 2011.  It is an official remake of the Telugu movie "Konchem Ishtam Konchem Kashtam".  It was an average for Dev after a long time.

Sunil Ganguly: Sunil Ganguly (Bengali: সুনীল গাঙ্গুলি ; 1 January 1938 – 12 June 1999) was an Indian instrumentalist from the city of Kolkata (Calcutta) who played the Hawaiian electric guitar.  He produced many 78 RPM, SP, EP, Super-7, LP discs, audio cassettes and CDs from HMV, Concord Records and Sagarika including classical-based songs like "Yaad piya ki aaye".  He made records of Indian Hindi film songs, classical based songs, and Bengali songs, and popularised the Hawaiian guitar in India, with his unique style and his accurate renditions enabled by his background in classical music.  His renditions often had subtle twists and turns that made it even more melodious than the original song.  At his peak, there used to be two LPs released during the Pujas every year by HMV, one containing songs by Lata Mangeshkar, and the other having instrumentals by Sunil Ganguly.  The film hits he recorded were instant hits with the youth.  Sunil Ganguly did many public performances all over India, including Kolkata, Mumbai, Delhi, Lucknow, Patna, Guwahati etc, including programs in classical music.  He did one-man whole night shows in Mumbai, played in reputed College fests like the IITs, RECs.  Some of the best musicians of the era, like Sri Y S Mulki, Sri Dilip Roy, Sri Samir Khasnabis, Sri Swapan Sen, Sri Manohari Singh accompanied him on his recordings and performances.  He was a regular performer at Doordarshan programs (TV) in Kolkata and Mumbai, AIR (All India Radio), Radio Ceylon (Sri Lanka).  His radio programs (like Saaz aur Awaz on Radio Ceylon) were popular and were listened to by many all over India, and this program continues to this date.  He inspired an entire young generation to play Indian music on the Hawaiian guitar.  He had many number of successful students, who are continuing his style of playing songs and in turn are coaching students in India and abroad.

Polam Pol: Polam Pol features songs sung by Farhad Bhiwandiwala, Nakash Aziz, Palak Muchhal, Shree Dayal, Ash King.  Music and Background Score for the film is composed by Paresh-Bhavesh.  The soundtrack was launched on 19 January.

Ash King: Ash King (born Ashutosh Ganguly Bengali: আশুতোষ গাঙ্গুলী ) is a singer of Bengali and Gujarati origin based in London.  He made his playback singing debut in Rakeysh Omprakash Mehra's Delhi-6.

Janani (1993 film): Janani (Bengali : জননী, Jononee) is a 1993 Bengali film directed and produced by Sanat Dasgupta with a financial assistance from National Film Development Corporation of India.  The film narrates an isolated life between a boy and his ostracized mother who is believed to be a witch in the village she lives in.  It is based on a Bengali short story named "Baen" (Bengali: বাঁয়েন) written by the renowned Bengali authoress Mahasweta Devi.  It was scripted by Partha Banerjee, Ashutosh Sarkar and Sanat Dasgupta himself.  The music of the film was scored by Partha Sengupta.  It stars Roopa Ganguly in the central role.

Deep Jwele Jaai: (Bengali: দীপ জ্বেলে যাই , To light a lamp) was a Bengali movie directed by Asit Sen released in 1959.  The film is based on Bengali short story titled, 'Nurse Mitra' by noted Bengali writer, Ashutosh Mukherjee.  The movie was remade in Hindi in 1969 by the same director as "Khamoshi".

Jeet Gannguli: Jeet Gannguli (born Chandrajeet Ganguly, Bengali: চন্দ্রজিৎ গাঙ্গুলী), popularly known as Jeet, is a music composer and singer of Bengali and Hindi movies.  Gannguli was initiated into the world of music at the age of three.  He was a student of Baranagore Ramakrishna Mission Ashrama High School from where he completed his schooling.  Later he graduated from the University of Calcutta.  He is trained in Indian classical music under the guidance of his father Kali Ganguly and his pisima (father's sister) Shibani Roychowdhury.  He studied western classical music, jazz and rock with jazz guitarist Carlton Kitto.  Gannguli is a music director in Bollywood, scoring music for films.

Safar (film): Safar (English: Journey) is a 1970 Indian Hindi film produced by the Mushir-Riaz duo and directed by Asit Sen, based on a novel by Bengali writer Ashutosh Mukherjee.  The film stars Ashok Kumar, Rajesh Khanna, Sharmila Tagore and Feroz Khan in lead roles.  The film became the tenth top-grossing production of the year.  It won one Filmfare Awards and four BFJA Awards.  Rajesh Khanna received nomination for BFJA Awards for Best Actor (Hindi). Asit Sen remade the 1956 Bengali film Chalachal, which was directed by him, in Hindi as Safar (1970).  As per review by critics, Safar was carried more than ably by Khanna’s immense charm at the peak of his popularity.  Rajesh Khanna beautifully conveys his character's desperation and his conviction that surviving by a slender thread is not really living.  This film is counted among the 17 consecutive hit films Rajesh Khanna between 1969 and 1971, by adding the two hero films Marayada and Andaz to the 15 consecutive solo hits he gave from 1969 to 1971.  The movie is a remake of director's own 1956 Bengali movie "Chalachal".

Supporting paragraphs: Polam Pol Ash King
Answer: Ash King