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🎵 Music theory concepts in Go.
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cmd/transpose
intervals
.gitignore
.travis.yml
LICENSE
README.md
chord.go
chord_test.go
interval.go
interval_test.go
math.go
note.go
note_test.go
parse.go
parse_test.go
pitch.go
pitch_test.go
scale.go
scale_test.go

README.md

Music Theory

Build Status GoDoc

Explorations in music theory.

Usage

package main

import (
    mt "github.com/brettbuddin/musictheory"
    "github.com/brettbuddin/musictheory/intervals"
)

func main() {
    root := mt.NewPitch(mt.C, mt.Natural, 4)

    root.Name(mt.AscNames) // C4
    root.Freq()            // 261.625565 (Hz)
    root.MIDI()            // 72

    P5 := mt.Perfect(5)   // Perfect 5th
    A4 := mt.Augmented(4) // Augmented 4th

    root.Transpose(P5).Name(mt.AscNames)          // G4
    root.Transpose(A4).Name(mt.AscNames)          // F#4
    root.Transpose(P5.Negate()).Name(mt.AscNames) // F3

    mt.NewScale(root, intervals.Dorian, 1)
    // [C4, D4, Eb4, F4, G4, A4, Bb4]

    mt.NewScale(root, intervals.Mixolydian, 2)
    // [C4, D4, E4, F4, G4, A4, Bb4, C5, D5, E5, F5, G5, A5, Bb5]

    rootPosition := mt.NewChord(root, intervals.DiminishedSeventh)
    // [C4, Eb4, Gb4, A4]

    firstInversion := rootPosition.Invert(1)
    // [C5, Eb4, Gb4, A4]

    secondInversion := rootPosition.Invert(2)
    // [C5, Eb5, Gb4, A4]

    note := mt.NewNote(root, mt.D16) // C4 sixteenth note
    note.Time(mt.D4, 120)            // 125ms (quarter note getting the beat at 120 BPM)
}

楽しみます!

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