A further variation from https://gist.github.com/jamesdabbs/a85fa5553df7dba0ba3dbb25f4cafe4b

README.md

💩 🚌👏

A programmatic reinterpretation of Steve Reich's Clapping Music

A variation on code from https://gist.github.com/jamesdabbs/a85fa5553df7dba0ba3dbb25f4cafe4b

Based on code & ideas from @celeenr's (https://twitter.com/celeenr) RubyConf 2016 talk "Rhythmic Recursion"

Try different voices for say.

For more fun things to put in mod, see Apple's Speech Synthesis Programming Guide

💩 🚌👏 .rb

require 'thwait'

class Voice
  BASELINE = %w( there is no - poop ing - on - the  bus - )
  VOICES   = `say -v '?'`.lines.map { |line| line.split.first }

  attr_reader :voice_name, :rate

  def initialize(voice_name, rate)
    @i = 0
    @voice_name = voice_name
    @rate = rate
  end

  def perform
    mod = word == "there" ? "[[volm +0.2]] " : ""
    Thread.new do
      if word != "-"
        system "say -r #{rate} -v #{voice_name} \"#{mod}#{word}\""
      end
      advance
    end
  end

  def advance
    @i = (@i + 1) % BASELINE.length
  end

  def word
    BASELINE[@i]
  end
end

class Beat
  attr_reader :time

  def initialize(time)
    @time = time
  end

  def perform
    Thread.new do
      sleep(time)
    end
  end
end

class Metronome
  def perform
    Thread.new do
      if ENV['METRONOME'] == '1'
        system "afplay -v 0.5 /System/Library/Sounds/Tink.aiff"
      end
    end
  end
end

a1 = Voice.new('Kathy', 400)
a2 = Voice.new('Agnes', 400)
beat = Beat.new(0.25)
metronome = Metronome.new

13.times do
  (Voice::BASELINE.length * 4).times do
    t1 = a1.perform
    t2 = a2.perform
    t3 = beat.perform
    t4 = metronome.perform
    ThreadsWait.all_waits(t1, t2, t3, t4)
  end
  a1.advance
end

NOTE: the metronome is helpful if you're debugging a voice that can't keep up. For instance, the Cellos voice plays for a minimum length that is too long, so the metronome ticks will not play at a constant tempo. Invoke the script with METRONOME=1 in the environment to enable it.