in a Katha by Sant Singh Maskeen ji, he mentioned about some raagis singing on filmi tunes. but, he said what to do, "hun koi srota hi nahi rehya" (now there is no listener/admirer of raag in the sangat that comes to gurughar).. so raag is fading away!!
but again.. there are only 7 sur, some raagis get a similar tune to bollywood songs accidentally, but its our effort to listen the shabad instead of remembering the tune and relating to some filmi song!!