Bach

A Music Theory library for .NET

Introduction

Bach is a .NET Core library that enables expressing Western tonal musical concepts in C#: Pitches, Intervals, Scales, Triads, Chords, Modes, etc.

This library has been a pet project of mine while learning a bit of music theory and, at the same time, keeping my C# and .NET skills up to date while I've been off doing C++ for quite a while.

Usage

Scales and chords are created from root pitches and formulas that describe them; these formulas are maintained in an extensible registry.

For example, to list all the scale formulas in the registry

foreach( var formula in Registry.ScaleFormulas )
{
  Console.WriteLine( $"Scale name '{formula.Name}', Intervals: '{formuula.Intervals}'" );
}

To display the intervals between a set of pitch classes:

var pitches = PitchClassCollection.Parse( "C,D,F,A" );
var intervals = pitches.Intervals().Select( interval => interval.ToString( "Sq" ) );
Console.WriteLine( $"Intervals: {string.Join( ",", intervals )}" );

To obtain the list of scales that contain a set of pitch classes:

var pitches = PitchClassCollection.Parse( "C,D,F#,A" );
foreach( var scale in Scale.ScalesContaining( pitches ) )
{
  Console.WriteLine( $"Scale name: '{scale.Name}'");
}

The included command line application demonstrates some of the available functionality:

• Dump the list of scales or chords in the registry,
• List the pitches and intervals in a scale or chord for a root pitch.
• Infer the intervals between a set of pitches.
• Infer the list of scales that contain a given set of pitches.

Contribution

• Feel free to make pull requests or fix any existing bugs.
• Feel free to open issues if you find music theory mistakes, bugs, or unexpected behavior.