The Echo Nest data is released under the same terms of use as their API. For a more readable version of the TOS, please read their ground rules. Put simply, if you are a researcher and want to publish results on the dataset, you are fine. If you are a company and are concerned about experimenting on the dataset, send an email to Paul at The Echo Nest.
Regarding the MusicBrainz data contained in the dataset, the track 'year' is under public domain and the 'tags' and 'tag count' are under Attribution-NonCommercial-ShareAlike 2.0 license.
Regarding the SecondHandSongs dataset, see its webpage.
Regarding the musiXmatch dataset, see its webpage.
The code is released under GNU Public License.
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