I was just browsing around on the internet trying to find some Mohd. Siddiq and Ranjit Kaur records and I came upon a blog called 'Punjabi Folk Singers'. On the blog there is a post about how the music for "Mujhe Neend Na" from the superhit film 'Dil' was lifted from a punjabi band calle Alaap. Here is the link for the post and it also has music clips.
http://punjabifolksingers.blogspot.com/2009/07/alaaps-influence-on-dil.html