She's a by-product of Zee's "Sa re ga ma" show which produced singers like her and Kunal Ganjawala both my favorites.
The show was then hosted by "Sonu Nigam" whos made his career from there as well. Its now hosted by "Shaan"
I became a big fan of her after listening to her voice in the movie Devdas.
Download the songs of Devdas here