- "http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0115255#s5\n",
- "https://www.discogs.com/developers/#page:database,header:database-artist-releases\n",
- "http://data.discogs.com/\n",
+ "### Some data sources\n",
+ "\n",
+ "* http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0115255#s5\n",
+ "* https://www.discogs.com/developers/#page:database,header:database-artist-releases\n",
+ "* http://data.discogs.com/\n",
+ "\n",
+ "* https://labrosa.ee.columbia.edu/millionsong/\n",
+ "\n",
+ "* https://twitter.com/kcimc/status/893855561590157312?s=09 and https://drive.google.com/file/d/0B9tyIRZ76JCdN3NtaVpPU3c4QWs/view (stored locally in the [1m.pkl](1m.pkl) folder)\n",