Falak Tak is a song from the movie Tashan. Tashan gave us Dil Dance Marre, a good, fast, addictive song. That's the one I came across first, before deciding to look up the rest of Tashan's soundtrack.
I heard the cover before I heard the original.
The cover continues to blow me away, so here it is - Falak Tak, as sung by Shromona Mukherjee:
In the info on the page, she says it doesn't sound right without a male voice. I disagree. It sounds fine - the clarity and beauty of her voice amaze me every time I hear it, and I only wish I could download it and play it alongside the original.