Unni Menon is a South Indian film playback singer. He has sung over 500 songs in South Indian languages like Tamil, Telugu and Malayalam. In the early part of his career, he spent many years as a low-profile playback singer. The turning point in his career came when he sang the song Puthu Vellai Mazhai from Mani Ratnam\'s award winning 1992 Tamil film Roja, composed by A. R. Rahman. He has frequently associated with A. R. Rahman, lending his voice to nearly 25 memorable songs from films like Karuththamma (1994) and Minsaara Kanavu (1997).
Who is most successful south Indian actress in bollywood?