Piano-midi.de: classical piano pieces (http://www.piano-midi.de/) Nottingham : over 1000 folk tunes (http://abc.sourceforge.net/NMD/) MuseData: electronic library of classical music scores (http://musedata.stanford.edu/) JSB Chorales: set of four-part harmonized chorales (http://www.jsbchorales.net/index.shtml) FMA: A Dataset For Music Analysis (https://github.com/mdeff/fma) Natural Images MNIST: