# Guitar Composers ToolBox

> Free interactive music toolkit for guitar, ukulele, bass, piano, and 7 folk instruments. 92 scale types in all 12 keys, chord finder with fretboard voicings, scale harmonizer, jazz and Latin standards with backing tracks, chord progressions, and flamenco techniques. Bilingual English/Spanish.

## About

- Author: Gus Escolà
- Founded: 2019
- URL: https://guitarcomposerstoolbox.com
- Languages: English, Spanish (all content available in both)
- License: Free to use, no paywall

## Content Categories

### Scales
- [Guitar Scales](https://guitarcomposerstoolbox.com/guitar-scales/c-major/): 92 scale types × 12 keys with fretboard diagrams, diatonic chords, modes, practice routines, and CAGED positions
- [Ukulele Scales](https://guitarcomposerstoolbox.com/ukulele-scales/c-major/): Same coverage for ukulele
- [Bass Scales](https://guitarcomposerstoolbox.com/bass-scales/c-major/): Bass guitar scale diagrams
- [Piano Scales](https://guitarcomposerstoolbox.com/piano-scales/c-major/): Piano keyboard diagrams
- [Alternate Tunings Hub](https://guitarcomposerstoolbox.com/tuning/): Scales, chords, and arpeggios for 14 alternate tunings — [Drop D](https://guitarcomposerstoolbox.com/chords/guitar/drop-d/), [Drop C](https://guitarcomposerstoolbox.com/chords/guitar/drop-c/), [DADGAD](https://guitarcomposerstoolbox.com/chords/guitar/dadgad/), [Open G](https://guitarcomposerstoolbox.com/chords/guitar/open-g/), [Open D](https://guitarcomposerstoolbox.com/chords/guitar/open-d/), Drop B, Open E, Open A, Open C, Baritone, and more

### Chords
- [Guitar Chord Finder](https://guitarcomposerstoolbox.com/guitar-chord-finder/c-major/): Every chord voicing across the fretboard with intervals and notes
- [Ukulele Chord Finder](https://guitarcomposerstoolbox.com/ukulele-chord-finder/c-major/): Ukulele chord voicings
- Alternate tuning chords: Pre-calculated chord voicings with finger assignments for 14 non-standard tunings across all chord types

### Arpeggios
- [Guitar Arpeggios](https://guitarcomposerstoolbox.com/guitar-arpeggios/c-major/): Arpeggio patterns across all fretboard positions
- Available for all 11 instruments

### Scale Harmonizer
- [Guitar Harmonizer](https://guitarcomposerstoolbox.com/guitar-harmonizer/c-major/): Diatonic triads, seventh chords, and modes for any scale — shows which chords belong to each key

### Jazz Standards
- [Jazz Standards](https://guitarcomposerstoolbox.com/jazz-standards/autumn-leaves-in-e/): 1022 standards (Autumn Leaves, All The Things You Are, Blue Bossa, etc.), each in all 12 keys. A play-along study tool, not just a backing track: as the tune plays, the fretboard lights up chord-by-chord with the correct improvisation scale (chosen by harmonic function and the next chord), the arpeggio and voice-led voicings, over a generated walking bass. Section looping, reference melody, 11 instruments. Free iRealPro alternative that also shows you what to play.

### Latin Standards
- [Latin Standards](https://guitarcomposerstoolbox.com/latin-standards/girl-from-ipanema-in-f/): 54 Latin standards (bolero, salsa, bossa nova, son cubano, tango), each in all 12 keys, with authentic piano montunos (real-pianist engine + Cuban clave) — and, in real time as you play, the improvisation scale, arpeggio and voicings for the current chord shown on the fretboard.

### Chord Progressions
- [Chord Progressions](https://guitarcomposerstoolbox.com/chord-progressions/): 40 progressions (I-V-vi-IV, ii-V-I, 12-bar blues, etc.), each in all 12 keys. As each progression plays, the fretboard shows the recommended scale, arpeggio and real voicings for the current chord, with Roman-numeral analysis, bar looping, tempo control and MIDI export.

### Flamenco
- [Flamenco Picados](https://guitarcomposerstoolbox.com/flamenco-licks/): 10 flamenco licks across Bulería, Tangos, Rumbas, Guajiras, and Tarantos with synchronized tablature and animated fretboard

### Practice Tools
- Circle of Fifths interactive tool
- Guitar Tuner
- Metronome

## Instruments Covered

Guitar, Ukulele, Bass, Piano, Mandolin, Charango, Cavaquinho, Cuatro Venezolano, Banjo, Tres Cubano, Timple Canario

## Technical Details

- Server-rendered HTML (Next.js App Router): metadata, JSON-LD, FAQ and full section listings are in the initial HTML; interactive players (backing tracks, fretboard) hydrate client-side
- Structured data: Schema.org JSON-LD on all pages (TechArticle, MusicComposition, FAQPage, HowTo, Organization)
- Sitemap: https://guitarcomposerstoolbox.com/sitemap.xml (132,000+ URLs)
- robots.txt: https://guitarcomposerstoolbox.com/robots.txt