Chord progressions of 25,000 songs
"So for example, the transition 4->1->5->6 is one of the most popular ones"
The graph does not show this or I'm misunderstanding something. The most popular looks like 1,4,1,5Also, what does the double, triple numbers mean? 664, 66 in the fist column. I know some music theory, but the article's explanation is rather confusing.