Song "Phir se" is a copy of original lyrics of a tv seial's theme/title song "Intjaar" , i'm not sure but I think it was on star plus.
About copy i'm sure.
But i'm giving 5/5 to this album , reason is they justified their modifications. Rahat sir rocked it. And Sonu nigam's version is also good.
All other songs are also good. Aarti version is lovable.