The dataset is a bunch of SQLite files, so shouldn't be too tricky to interrogate.
You can get a subset (static.echonest.com/millionsongsubset_full.tar.gz), which is 1.8Gb compressed. The full dataset is 280Gb, and AFAICT, this does not contain the full audio.
There's a script on GitHub from like 8 years ago that apparently can get you the audio (but I would be super-impressed if that actually still works).
It looks like they have data about many of the individual notes in the song. I wonder if it could be possible to turn that data back into some sort of horrible midi version.
