Designer Felix Sockwell shows his sketches he did for Apple back in 2004.
On his blog he writes:
This is what you've known as iTunes, then and now. It's interesting but completely non proprietary. They can't own a note in a circle but you know what? It works. It functions without selling or describing or promising or promoting. In that way, all the work I did for Apple was a total failure and I completely missed the mark.
Regardless if Apple bought these ideas or not I feel there are some really great ideas in there.