From an existing jazz chart this command line utility semi-randomly generates a new "similar" jazz chart.
For that it builds a representation of the initial chart in form of a Markov chain where the chords are the states of the chain.
The generated chart is similar to the initial chart in the sense that the chord transitions are generated by randomly picking among the existing chord transitions of the initial chart, the more a chord transition occurs in the initial chart, the more chances it has to be picked when generating the new chart. More precisely, it uses a second-order Markov chain by considering the transitions from two consecutive chords to the next one. Thus it generates more "phrasal" structures than a first-order approach.
This code was written during the Mendicant University course of January 2012.
It requires Ruby 1.9+.
examples/generate_chart.rb chart_file first_chord second_chord
The chart file must be a text file where the chord names are simply separated
by one or more spaces. See in the charts directory a few examples.
The first and second chords you choose to start your new chart must be appear consecutively in the initial chart.
Example: examples/generate_chart.rb data/charts/what-a-wonderful-world.chart A- G-7
The examples/hammelin_chart.rb script uses the
Hammelin gem to play the generated chart.
It requires JRuby.
Example: ruby --1.9 examples/hammelin_chart.rb data/charts/hammelin.chart F C
ruby spec/music_chart_generator/*
Released under the MIT license.