Question: What type of profession does Utpala Sen and Hemanta Mukherjee have in common?

Context paragraphs:
Hemanta Mukherjee: Hemanta Mukherjee ((16 June 1920 – 26 September 1989); often credited as Hemant Kumar outside Bengal) was an Indian playback singer, music director and film producer, who sang in Bengali, Hindi and other Indian languages.  He is also the greatest artist of Rabindra Sangeet.  He won two National awards for the category best male playback singer.  He is often credited as one of the greatest Indian singers of all time for his unparalleled manly voice.

Biwi Aur Makan: Biwi Aur Makan is a 1966 Hindi film directed by Hrishikesh Mukherjee.  The film was released with music composed by Hemanta Mukherjee.  The film starred Biswajit Chatterjee, Kalpana Mohan, and Mehmood in lead roles.  The movie was remade in Marathi in 1989 as "Ashi Hi Banwa Banwi" , in Kannada in 2013 as "Olu Saar Bari Olu" and in Hindi as "Paying Guests".

Swapno: Swapno is a 2005 Bengali film directed by Haranath Chakraborty.  The film features actors Prosenjit Chatterjee and Sayantani Ghosh, Jishu Sengupta, Abhishek Chatterjee, Deepankar De, Anamika Saha, Rajesh Sharma in the lead roles.  Music of the film has been composed by Hemanta Mukherjee, Shyamal Mitra and Madhu Mukherjee.

Bela Mukherjee: Bela Mukherjee (d. June 25, 2009) was an Indian singer and the wife of singer and music director Hemanta Mukherjee.  She recorded a number of songs with her husband.

Saptapadi (1961 film): Saptapadi (English: Seven steps) is a 1961 Indian Bengali romantic drama film by Ajoy Kar, starring Suchitra Sen, Uttam Kumar, Chhabi Biswas and Chhaya Debi.  Regarded as the romantic blockbuster of the evergreen romantic pair of Bengali cinema, Uttam Kumar and Suchitra Sen, accompanied with mesmerizing music direction and playback singing in Uttam's voice by Hemanta Mukherjee and in Suchitra's voice by Sandhya Mukherjee.  The story is based on a novel of 1958 written by Tarasankar Bandyopadhyay.

Utpala Sen: Utpala Sen (12 March 1924 - 13 May 2005) was a prominent Indian Bengali playback singer.  She was a very popular playback singer in the 1950s alongside Sandhya Mukherjee, Pratima Banerjee and Alpana Banerjee etc.  She has sung numerous duets with prominent male singers such as Hemanta Mukherjee, Manna Dey and also her husband, Satinath Mukherjee.

Kuheli: Kuheli ("Bengali": কুহেলী) is a Bengali suspense thriller movie directed by Tarun Majumdar.  This movie released in 1971.  Music director of the movie was Hemanta Mukherjee.

Hemanta Mukherjee metro station: Hemanta Mukherjee Metro Station is a station of Line 6 of the Kolkata Metro.  The station is named in honour of the Indian Bengali playback singer Hemanta Mukherjee.

Harano Sur: Harano Sur (Bengali: হারানো সুর;English:The Lost Melody ) is a 1957 Indian Bengali romantic drama film by Ajoy Kar, starring Suchitra Sen and Uttam Kumar, with music by Hemanta Mukherjee, and sung by Geeta Dutt.  The film is regarded as one of the finest examples of Bengali cinema of this early golden period.  The film has broad similarities in plot with the 1942 Hollywood flick Random Harvest and has been remade twice more in India: the Tamil film Amara Deepam (1956 film) and the Hindi film Amar Deep (1958 film).

Oos Raat Ke Baad: Oos Raat Ke Baad is a 1969 thriller movie, directed and produced by YB Siraj under the banner Commercial Cine Corporation.  The movie stars Sanjeev Kumar, Tanuja, Madan Puri, Sailesh Kumar, Aruna Irani, Shamminder and Kishore Bhatt.  Other star casts include Tarun Bose, Bela Bose, Asit Sen, Pravin Paul Sunder, Amrita Patel, Dinesh Hingoo and Masterji.  Story-screenplay-dialogue was written by Probodh Joshi.  Mukesh, Asha Bhosle, Bula Gupta and Hemant Kumar rendered their voices.  Title Song was by Anil Kumar and its lyrics by Gohar Kanpuri.  Music of the film is given by Hemanta Mukherjee and lyrics by Gulzar.

Supporting paragraphs: Utpala Sen Hemanta Mukherjee
Answer: singer