Question: What Hindi singer originally sang the song "Har Kisi Ko"? 

Context articles: Terje Bakken
Wendy Matthews
Ahista Ahista (1981 film)
Frank Seamans
They Call the Wind Maria
Classic Blue
Pamela Jain
Suraiya
Har Kisi Ko
Manhar Udhas

Terje "Valfar" Bakken (September 3, 1978 – January 14, 2004) was the lead singer and founder of the Norwegian black metal band Windir.
 Windir was started as a one-man project, but it was expanded into a full band with the release of their third album, "1184".
 Valfar originally sang his lyrics in Sognamål, a dialect of Norwegian, but eventually switched to English in an attempt to appeal to a broader audience.
Wendy Joan Matthews (born 1960) is an Australian adult alternative pop singer originally from Canada who has been a member of Models and Absent Friends and is a solo artist.
 She released Top 20 hit singles in the 1990s including "Token Angels", "Let's Kiss (Like Angels Do)", "The Day You Went Away" and "Friday's Child" with Top 20 albums, "You've Always Got the Blues" (duet album with Kate Ceberano), "Émigré", "Lily", "The Witness Tree" and her compilation, "Stepping Stones".
 She has won six Australian Recording Industry Association (ARIA) Awards.
 According to rock music historian, Ian McFarlane she provides "extraordinary, crystal-clear vocals [...] a soulfulness that was the mark of a truly gifted singer".
Ahista Ahista (Hindi: आहिस्ता आहिस्ता , Urdu: آہستہ آہستہ‎ , translation: Slowly Slowly) is a Bollywood film released in October, 1981.
 The film stars Kunal Kapoor, Padmini Kolhapure, Shashikala, Shammi Kapoor, Ashalata Wabgaonkar and Nanda.
 Beautiful lyrics and earpleasing music were the highlights of this film.
 'Kabhi kisi ko muqammal jahan nahin milta' (twice), 'mana teri nazar mein', 'bin bulaye hum chale aaye' and 'nazar se phool chunati hai nazar' were welcomed by the music lovers.This film is remake of famous Kannada film "Gejje Pooje".
Frank Seamans is the former tenor singer for the Southern Gospel Quartet Legacy Five.
 He originally sang with The Sound, the group that brought Legacy Five lead singer Scott Fowler's attention to the Cathedrals Quartet.
 He is now serving as Pastor of Freedom Fellowship Church in Pearland, TX.
"They Call the Wind Maria" is an American popular song with lyrics written by Alan J. Lerner and music by Frederick Loewe for their 1951 Broadway musical, "Paint Your Wagon", which is set in the California Gold Rush.
 Rufus Smith originally sang the song on Broadway, and Joseph Leader was the original singer in London's West End.
 It quickly became a runaway hit, and during the Korean War, the song was among the "popular music listened to by the troops".
 Vaughan Monroe and his Orchestra recorded the song in 1951, and it was among the "popular hit singles at the record stores" that year.
 It has since become a standard, performed by many notable singers across several genres of popular music.
 A striking feature of the song in the original orchestration (also used in many cover versions), is a driving, staccato rhythm, played on the string instruments, that evokes a sense of restless motion.
Classic Blue is the fourth solo studio album by The Moody Blues member Justin Hayward.
 "Classic Blue" was released in 1989 by Trax Records (later re-released on Castle Music Records in 1994), and features Mike Batt, who also produced the album, and the London Philharmonic Orchestra.
 The album includes cover versions of many hit songs, such as The Beatles' "Blackbird", and Led Zeppelin's "Stairway to Heaven."
 It also includes a re-recorded version of "Forever Autumn," a song from "Jeff Wayne's Musical Version of The War of the Worlds", in which Hayward originally sang lead vocals.
Pamela Jain is a Hindi singer.
Suraiya Jamaal Sheikh (15 June 1929 – 31 January 2004), popularly known as Suraiya, was an Indian Muslim Hindi/Hindustani film actress and playback singer in Bollywood from the 1940s to the early 1960s, who remained unmarried throughout her life, after her love affair with actor Dev Anand was aborted by her maternal grandmother.
 She was the most popular singing star of the Indian sub-continent of her generation.
 Until 1943, as a child singer, Suraiya did playback singing for one actress, namely Mehtab, in three films, and also in some of her own films for her roles as a child artiste.
 After this, she only sang for her own films as an actress, and acted as a heroine from 1946 until the end of her career in 1963.
 From 1948 to 1951, she became the singing superstar of Bollywood, earning more for her performances than all the performing actors of the times, male or female, including Dev Anand, Raj Kapoor, Dilip Kumar, Nargis and Madhubala.
 She received 1.5–2 lakhs rupees for her role per film, when top male actors were getting 50 thousand to 1 lakh rs.
 For a song, she commanded rs. 1000, while Lata Mangeshkar was getting rs. 100–200 per song.
 She was the only child of her parents.
 She had a natural talent for singing, acting and dancing from childhood.
 She received basic training in music when her mother used to take her to a Hindustani music teacher or 'masterji' for training.
 She first sang for a children's program for All India Radio in 1937.
 Later on Naushad gave her on the job 'training', while recording.
 She went on to become one of the most successful singing film stars of Bollywood.
 She had received training in dancing from Mumtaz Ali, dancer-actor and father of the famous comedian Mehmood.
 She was also known for her North Indian Muslim feudal style acting or 'adakari' in many of her films ("Mirza Ghalib (film)", "Phool", "Afsar", "Shayar", "Jeet (1949 film)", "Anmol Ghadi" and "Dastan").
 This style 'endowed modernity with an aura of tradition' and brought nostalgic feudal tinge to the scenes.
 Her performance 'expertly integrated gestures, music and speech'.
 Suraiya in her heyday was known as 'Malika-e-Husn' (queen of beauty), 'Malika-e-Tarannum' (queen of melody) and 'Malika-e-Adakaari' (queen of acting), all rolled into one.
 In a career spanning from 1936 till 1963, Suraiya sang 338 songs in films (which were mostly her own films) and 2 in addition were non-film songs, namely, 'tum rahe kahan ko piya' and 'hum tum karenge pyar'.
 She acted in 67 movies, which do not include the incomplete films such as "Jaanwar" (with Dilip Kumar), "Paagal Khaana" with Bharat Bhushan and an Indo-British film on Wajid Ali Shah (1953) being directed by British director, Herbert Marshall, with Ashok Kumar in the role of Wajid Ali Shah.
"Har Kisi Ko" (English: For everyone) is a Hindi song from the 2013 Bollywood film, "Boss".
 Re-created by Chirantan Bhatt, the song is sung by Nikhil D'Souza, with lyrics by Manoj Yadav.
 The music video of this solo track features actors Shiv Pandit and Aditi Rao Hydari.
 A duet version of the same song was released as part of the film soundtrack, which was rendered by Arijit Singh and Neeti Mohan.
 This version is picturised on Akshay Kumar and Sonakshi Sinha.
 The song was originally composed by Kalyanji–Anandji, with lyrics by Indeevar and sung by Manhar Udhas and Sadhana Sargam for 1986 Bollywood film "Janbaaz".
 The original version is picturised on Feroz Khan and Sridevi.
Manhar Udhas is a Hindi and Gujarati language singer and Bollywood playback singer.