data/
    raw/*
        - All of the MIDI files that have been generated and collected so
          far
    all_songs/*
        - A subset of the *raw* directory that only includes songs that
          have been manually labeled as "songs", as opposed to empty
          tracks, sound effects or other background songs.
    training_songs/*
        - A subset of the *all_songs* directory, approx 2/3 of it,
          containing songs that should be used to generate and train
          the algorithm with.
    testing_songs/*
        - A subset of the *all_songs* directory, containing the approx
          1/3 of the songs that are not in the *training_songs* directory,
          that should be used for testing the accuracy of the algorithm
    training_counts.sqlite3
        - The generated sqlite3 database of transition counts (generated
          with the *training.py* file) based off the *training_songs*
          directory