Octavian

Octavian is a little utility library for working with musical notes and their frequencies. Super cool, right?

Installation

First things, first: how do I install this thing?

npm install octavian

Maybe you even throw a --save in there if you feel like keeping it around.

Usage

So, we've got Octavian installed, how do we use it?

var Octavian = require('octavian');

var note = new Octavian.Note('A4');

Or, if you're some kind of hipster…

var Note = require('octavian').Note;

var note = new Note('A4');

The Basics

A Note has a few properties that we can play around with.

var note = new Note('A#4');

note.letter; // 'A'
note.modifier; // '#'
note.octave; // 4
note.signature; // 'A#4'
note.pianoKey; // 50
note.frequency; // 466.164

Normalization

But, what if we toss in some bogus note? Something like E#, maybe? There is no E#, right?

var note = new Note('E#5');

note.signature; // 'F5'

Intervals

Music is all about intervals. We can move up by a semitone or some other interval.

var note = new Note('C3');

note.majorThird(); // returns a new Note('E3');
note.perfectFifth(); // returns a new Note('G3');
note.perfectOctave(); // returns a new Note('C4');

You can do any of the following:

• downOctave()
• minorSecond()
• majorSecond()
• minorThird()
• majorThird()
• perfectFourth()
• diminishedFifth()
• perfectFifth()
• minorSixth()
• majorSixth()
• minorSeventh()
• majorSeventh()
• perfectOctave()

There are also some extra methods that are aliased, if you'd prefer:

• augmentedFourth()
• third()
• fifth()