Was listening to Sant Ji's katha on youtube.
Sant ji stated apart from the traditional raags, there is nothing wrong if Kirtan is sung in other NON - Raags set up by our Guru Ji's.
His example: Think of poison in a bowl. Drinking the poison then blaming the bowl is silly. The poison is bad not the bowl. Likewise, we will never call a bowl Amrit once it contains Amrit init. Sameway it's not the raags being good / bad... it's WHAT we put into those raags. How many times Kirtan was sung but on a track of sum Bollywood tune? It is happening in Gurudwara by Raagis! Youtube also has Kaweshri jatha singing history of 1984, on Dr Dre's - Still Dre track.
Rap instrumental/ Bolly tunes stand neutral. We can either put bad things and sing with our own remixes and lyrics... or we can recreate to sing Shabads of Gurbabi, kirtan and Sikh Prachaar over them.