He was not always commercially successful. He gave Indeewar and Anand Bakshi their first breaks in the industry as lyricists; these two would later become two of the most sought-after songwriters in Mumbai from the late 1960s onwards.
In 1952 his another gem of a movie"Naubahaar" starring Ashok Kumar and Nalini Jaywant released,again its music became very popular,Another immortal song “Ae ri main to prem deewaani” is a traditional Meera Bhajan which is adapted as a lyrics by Satyendra Athaiyya. It is sung by Lata and it is picturised on Nalini Jaiwant and Ashok Kumar.Most of the songs were sung by Lata Mangeshkar, one by Rajkumari and one by Talat Mahmood. Whether it was the vivacious “Unke bulawe pe dole mera dil” or the tenderness of “Dekho ji mera jiya churaye liye jaaye” or the devotion and pathos of “Ai ri main to prem diwani” (which Lata has included in her best ten list) or the restlessness and anguish of “Woh paas nahin majboor hai dil, hum aas lagaye baithe hain”, Lata has shone like a dazzling star.
In the 50s Roshan gave many musical hits likr Shesham and Anhonee,the song "Main Dil Hoon Ek Armaan Bhara" is a classic from Talat Mahmood This is a song sung by Talat Mehmood and picturised on Raj Kapoor. It is a rare combination of singer and actor, but the song itself is quite well known
The 1960s proved to be the golden age for Roshan and his music. His ability to mould folk music with Hindustani classical music became his trademark and resulted in movies scores. During this time Roshan gave hits such as Na to karavan ki talaash hai from Barsat Ki Raat and Zindagi bhar nahi bhoolegi woh barsaat ki raat (Barsaat Ki Raat, 1960),Ab kya misaal doon and Kabhi to milegi, kahi to milegi (Aarti, 1962), Jo vada kiya vo nibhana padega, Paao chhoon lene do and Jurm-e-ulfat pe (Taj Mahal, 1963), Nigahen milane ko jee chahata hai and Laaga chunari mein daag (Dil Hi To Hai, 1963), Sansaar se bhaage phirte ho and Man re tu kaahe (Chitralekha, 1964), and Oh re taal mile andKhushi khushi kar do vida (Anokhi Raat, 1968).
He composed some melodies for the movie Mamta (1966) with lyrics by Majrooh Sultanpuri, 'Rehte the kabhi jinke dil mein',Rahen Na Rahen Hum sung by Lata Mangeshkar and her hit duet, Chuppa Lo Yun Dil Mein Pyar Mera with Hemant Kumar. Devar (1966): "Aaya hai mujhe phir yaad woh zalim, guzara zamana bachpan ka"; "Baharon ne mera chaman loot kar"; "Duniya mein aisa kahan sab ka naseeb hai".
Roshan in my opinion was a very under-rated music director who got his due recognition very late. He created some of the most outstanding scores. His biggest strength was mixing of Folk Music with classical music, this approach made him different from other music directors. In1963 Filmfare Best Music Director Award for Taj Mahal.
Roshan had been suffering from chronic heart trouble for over 20 years. He died of a heart attack in Mumbai, Maharashtra, India, on 16 November 1967 aged 50, leaving behind a wife, two sons and two daughters. Besides immediate family, Roshan left great admirers of extended family—Nagrath and Khokha family