[superted]

Good job "emulating" the iTunes algorithm. Request to op: It would have been good to have some sample code inline in the article that illustrated the algorithm. I know there's an Xcode project attached, but reading this on an iPad has its limitations.

[skeletonjelly]

Some pictures would have helped too, considering not everyone has iTunes, and it's an article about a visual feature. OP could have tried out the new Gist to display code too

Edit: I meant pictures of the existing Apple implementation to see what they were on about. I see the pictures of their algorithm but it makes no sense to talk about the comparison when there's nothing to compare to