Best known for her songs, "Sun Bairi Baalam Sach Bol Re" in Bawre Nain (1950), "Ghabaraa Ke Jo Hum Sar Ko Takraayan" in Mahal (1949) and "Najariya Ki Maari" in Pakeezah (1972).
She had much softer and sweeter voice with a narrow range than the leading singers of the time, Zohrabai Ambalewali, Amirbai Karnataki and Shamshad Begum.
In the next two decades, she sang for 100 films, till the early 1950s, when Lata Mangeshkar changed the playback-singing scene in India.
He gave music to films starring Rajkumari ji like Nai Duniya, alias Sacred Scandal (1934) (Sansaar Leela in Gujarati version), Laal Chitthi, alias Red Letter (1935), Bombay Mail (1935), Bambai Ki Sethaani (1935) and Shamsheer-e-Arab (1935).
She also sang many popular Punjabi-language film songs for the veteran Punjabi music directors Hansraj Behl and Sardul Kwatra in the 1950s.
Dubey who was from Benares, (Uttar Pradesh) where he spent a lot of his time (because he owned a shop there), while she settled in Bombay.
[1] During her career, she would go on to sing songs for Neel Kamal, a Raj Kapoor and Madhubala starrer, and Hulchul (1951); but her two most famous films would be Bawre Nain (1950),[3] where she sang for Geeta Bali "Sun Bairi Baalam Sach Bol Re" [4] and Mahal (1949), where she sang "Ghabrekar Ke Jo Hum Sir Ko Takraayan" picturised on Vijayalakshmi and "Chun Chun Gunguruva Baje Jhumba", a duet with Zohrabai Ambalawali.
Rajkumari endured a long dry spell until music director Naushad spotted her singing in the chorus for his background score for Pakeezah (1972).
Naushad was much taken aback by this, having greatly respected her in her heyday, and heartbroken to hear that she was reduced to singing in the chorus to make ends meet.
Rajkumari also appeared in a British TV programme called Mahfil on Channel 4, a Samandar Films production, produced by Firdous Ali and Mahmood Jamal.