This is a really interesting article. A problem I've discussed on HN before is the "dynamic playlist."[0] Creating a music map like this provides a complete and elegant solution to this problem. Choose starting and ending tiles on the map, find any path between those tiles and you have your playlist. I might try my hand at implementing this soon.
In the past I had focused on using listener-generated data from sites like Last.fm, but if it turns out that musical similarity can be accurately determined using statistical methods that makes the whole thing much, much simpler.
I haven't really looked in it yet, but it seems that "statistical features" here are mostly about replay-gain, which makes wholes thing much less interesting and isn't "complete solution" whatsoever.
In the past I had focused on using listener-generated data from sites like Last.fm, but if it turns out that musical similarity can be accurately determined using statistical methods that makes the whole thing much, much simpler.
[0] https://news.ycombinator.com/item?id=7630167