I've followed the instructions at:
https://github.com/tensorflow/magenta
and run the following command line.
./bazel-bin/magenta/convert_midi_dir_to_note_sequences --output_file=../output --midi-dir=../midi
My machine chugs for a couple of minutes and produces a fairly massive output file, which is cool.
My question is, what do I need to do next to generate a new composition?
We've recently added a model that you can train to generate new sequences. Have a look at https://github.com/tensorflow/magenta/blob/master/magenta/models/basic_rnn/README.md.
Thanks!