I analyzed the chords of 1300 popular songs for patterns. This is what I found. is a post on the blog for Hooktheory. I found it via Waxy Links. The authors analyzed chord progressions to find which keys and chords are common. While I was slightly surprised that some keys were not represented more often, the basic results are what any musician would predict. It is interesting, though, that the conclusions came from data analysis rather than music pedagogy.
The site includes analyses of many popular songs. For instance, look at the one for “Wonderwall” by Oasis. It includes a piano roll charting of the song that can be synchronized with a video or played and transposed as an instrumental. The tool is amazing, and the potential is great.
I expect the recording industry to kill the site and the business. The Copyright page has guidelines regarding fair use. While I think the arguments there are sound, I expect the site to face great difficulties. Even if they are correct, the cost of presenting them might be prohibitive.