rb-music¶ ↑

rb-music is a Ruby gem for working with musical notes, scales and intervals. It is basically a direct port of the wonderful music.js library by Greg Jopa.

Installation¶ ↑

In your Gemfile:

gem 'rb-music', git: 'https://github.com/mwise/rb-music', branch: 'master'

In your Ruby code:

require 'rb-music'

Overview¶ ↑

Note¶ ↑

Note.from_latin(name): Note by latin name and octave

n = Note.from_latin('A4');  # single note
n.frequency  # 440
n.latin  # "A"
n.octave # 4 

n = Note.from_latin('C4')  # base note for scale
n.scale('major') # scale = array of notes

Interval¶ ↑

Interval.from_name(name): Interval by name

Interval.from_semitones(num): Interval by semitones

Interval.from_name('fifth') # define by name
whole_step = Interval.from_semitones(2) # define by # of semitones

c = Note.from_latin('C3')

# use intervals to transpose notes
d = c.add(whole_step) 

# use intervals to define chords
cmaj = c.add(['unison','major third','fifth'])