Kaur has recorded songs for film music in multiple Indian languages, including Hindi, Punjabi, Malayalam, Tamil and Urdu, and has established herself as a leading playback singer of Indian cinema. She has worked with leading music directors(including A R Rahman, Pritam Chakraborty, Vishal-Shekhar, Salim Sulaiman, Shankar Ehsaan Loy, Amit Trivedi, Shantanu Moitra, Tanishk Bagchi, Himesh Reshammiya, Sanjay Leela Bhansali, Sohail Sen. She's one of the very few Indian singers to have sung for a Hollywood film. Her track R.I.P., composed by AR Rahman, was a part of Oscar-winning director Danny Boyle's film "127 Hours". She has also sung a few songs for the Pakistani film and television industry.