Simple music theory library with a focus on guitar. Comes with a CLI tool for exploring scales and chords.
Instal the CLI tool using npm
$ npm install -g fretsonjs
Show the composition of a chord on the fretboard (also works with scales and scale modes)
$ fretson show chord C# major --fretboard 12 --tuning "Drop D"
. . . . :
E |--F--|-----|-----|--G#-|-----|-----|-----|-----|--C#-|-----|-----|-----|
B |-----|--C#-|-----|-----|-----|--F--|-----|-----|--G#-|-----|-----|-----|
G |--G#-|-----|-----|-----|-----|--C#-|-----|-----|-----|--F--|-----|-----|
D |-----|-----|--F--|-----|-----|--G#-|-----|-----|-----|-----|--C#-|-----|
A |-----|-----|-----|--C#-|-----|-----|-----|--F--|-----|-----|--G#-|-----|
D |-----|-----|--F--|-----|-----|--G#-|-----|-----|-----|-----|--C#-|-----|
List all available scales
$ fretson list-scales
major R 2M 3M 4 5 6M 7M
harmonic_minor R 2M 3m 4 5 6m 7M
melodic_minor_ascending R 2M 3m 4 5 6M 7M
melodic_minor_descending R 2M 3m 4 5 6m 7m
chromatic R 2m 2M 3m 3M 4 4a 5 6m 6M 7m 7M
whole_tone R 2M 3M 4a 6m 7m
major_pentatonic R 2M 3M 5 6M
minor_pentatonic R 3m 4 5 7m
pentatonic_blues R 3m 4 4a 5 7m
pentatonic_neutral R 2M 4 5 7m
octatonic_h_w R 2m 3m 3M 4a 5 6M 7m
octatonic_w_h R 2M 3m 4 4a 6m 6M 7M
...
Explain the composition of a scale (work in progress)
$ fretson explain scale major_pentatonic
intervals: R 2M 3M 5 6M
steps: w w 3 w 3