This is nice as a diary of some hacking, but much of the musical commentary is misleading. Basically the author has enumerated all the unique ways of selecting

This is nice as a diary of some hacking, but much of the musical commentary is misleading. Basically the author has enumerated all the unique ways of selecting the numbers 1..7 four times with replacement, and then done various mechanical translations on the results. Ostensibly this is done to enumerate all possible four-bar chord progressions, though in practice the results are highly redundant (i.e. many results are musically identical) and incomplete (many possible chords aren't included - e.g. secondary chords). Then rather than distributing the scripts the author presumably used to do the enumerating and translating, they are distributing the outputs of the scripts, as a huge tarball full of midi files. Not sure what the motivation here was.