A while ago, I wrote a small article on copied songs - using the oldest trick in the book, adding to someone else's list. In response to that post, I received an email from Karthik. Turns out, if I was looking to be the number one authority on such stuff, I possessed not even the right order-of-magnitude of greatness required for the job. Here's Karthik's link: Inspired Indian Film Songs (I see now that there's even a whole group of people discussing and exchanging material from this website! Wow!)