Lab 5 - Automated Composition (12 pts)

This lab should be turned in on Canvas by Monday Midnight (AoE).

For this lab you will implement two automated composition techniques and reflect on the experience First, you will use the magenta.js library to implement neural network-driven composition. Then, you will implement one of the three automated composition techniques we discussed this week from scratch. As a reminder, these are:

Part I (2 pts)

For this, you will start with the code at Demo: Magenta. Walk through this code to understand what is happening (it is gratuitously commented). You can check the reference material cited below for more information.

You task is to hook this up to your synth from Lab2 (or a classmate’s synth if you are not happy with your Lab2 synth).

The tutorial on which this code is based:

Full API reference for Magenta.js is here:

There is more you can do with Magenta.js. Check out some demos here:

Part II (7 pts)

Now we implement automated composition from scratch. Choose from below:

All of these options can run as a static process that generates a sequence of notes, then plays them back. you do not need anything to continuously play back. Of course, you are welcome to go above and beyond if you like (it is not a huge step, and makes the tool more fun).

You may use utility libraries are necessary. For example, you may use a matrix multiplication library, but not a markov chain library.

Markov Chain Learning

You must be able to learn an n-th order markov chain from input data. You may use the TWINKLE_TWINKLE input data from the magenta example, or, if you prefer, use the blobToNoteSequence function to read in MIDI files.

Cellular Automata

This approach is purely generative, no input data needed. You must implement a 2D cellular automata, then map the output to notes, which you play back. There is a large creative space in how the mapping actually works - find something that motivates you. Similarly, you do not need to stick to any particular rules for the automata generation - remember that cellular automata are more general than the Game of Life.

Pitch Set Theory

Use pitch set theory to automate a composition. You will need to implement functions for transpose, inverse, and retrograde of a pitch class sequence. Then, implement a function that takes an initial pitch class set, and randomly applies the aforementioned operations to generate a composition.

You do not need to implement a normalization procedure. You can assume the input pitch set classes are already in normal form.

Check the course slides for more information on pitch set theory resources.

Part III (3 pts)

Write your your experience in this lab in a blog post. Please use the bare minimum amount of formatting (e.g. <p></p> tags). This blog post should be readable by someone outside of this class, but knowledgeable in WedAudio. As a reference for the style of writing you should emulate, see