Mumbai, Jan 19 (ANI): Famed Bollywood composer and singer, AR Rahman, while promoting the upcoming romance-drama film "Highway" in Mumbai, expressed his delight in singing a soft romantic number "Maahi Ve" written by Irshad Kamil for the film. Rahman, who has composed the music and has sung for several films before said he had never sung a Punjabi song. He further added that there is also a song sung by lead actress of the film, Alia Bhatt, which will be a surprise for the audience.