Music Theory Companion v6.1.1

Music Theory Companion v6.1.1 Music Theory Companion v6.1.1 helps musicians master scales, chords, key changes, and progressions. Practice with ear training, a pitch detector, piano keyboard, guitar fretboard, and an accurate metronome.

Music Theory Companion v6.1.1

Music Theory Companion is an essential app for musicians who want to deepen their music theory skills. It helps you explore scales, chords, alternate chords, the circle of fifths, voice leading, modulations, and key changes. Whether you’re writing songs or refining your harmony, you can use it to discover fresh chord progression ideas.

Inside the app, you’ll find a large collection of scales and chords built for both performers and composers. It also includes powerful practice and learning tools such as ear training, a pitch detector, a chord library, a piano keyboard, a guitar fretboard, and a highly reliable metronome.

The metronome is designed to stay steady with accurate timing, so you won’t need a separate metronome app during practice. Singers can also use the Scale Practice tool for vocal training.

For harmony exploration, the Circle of Fifths tool is one of the most used features—it presents the scales and modes along with triad and seventh chords. For voice-leading guidance, the app offers Cube Dance, which supports voice-leading ideas based on Neo-Riemannian theory.

Overall, Music Theory Companion is a complete music theory toolkit for composing, studying, chord hunting, progression building, key changes, voice leading, and more. It’s available for free on Android.

Key Features

• Large library of scales and chords: Browse 86 distinct scales and modes to unlock new melodic options for songwriting, composing, or instrument tuning.
• Alternate chord–scale combinations: Find matching chords to harmonize a melody, or explore different scales to shape a song—like twisting a musical Rubik’s cube until it “clicks.”



• Circle of fifths (or fourths): See the circle in a clear visual layout for every scale, with support for both clockwise and anti-clockwise movement.
• Voice leading and modulations with “Cube Dance”: Use the Cube Dance guide for voice-leading ideas grounded in Neo-Riemannian theory, along with chord progression suggestions for smoother harmonic motion.
• Big chord library + interactive practice tools: Access 1000+ chords and learn chord construction. Practice scales using the pitch detector, and stay on tempo with a precise metronome.
• Music Theory Companion community: Join a lively Facebook community to meet other musicians, share music, get feedback, and enjoy discussions about chord progression “mysteries.”

App Functions

• Scales & Chords: 86 heptatonic scales/modes plus their diatonic triad and seventh-chord structures.
• Matching Chords: Suggests alternate chords that can be played for any note within any scale.
• Matching Scales: Lists alternative scales that can be played starting from a chosen scale.
• Circle of Fifths (or Circle of Fourths): Available for all scales.
• Cube Dance: Voice-leading guide based on Neo-Riemannian theory.



• Intervals: Ear training for intervals across all keys.



• Chord Library: Includes 1000+ chords and also shows how each chord is constructed.
• Modulations: Offers different chord progression paths to help you move smoothly between harmonies.



• Scale Practice: Uses a pitch detector to help you practice scales on guitar, piano, or vocals.
• Metronome: Perfect timing plus configurable sounds.
• Piano: A realistic piano keyboard with multiple instrument sounds.
• Symbols: Quick, handy online reference for musical symbols.
• Reference: A large collection of online music theory reference material.



• Guitar fretboard: Realistic fretboard view with both left-handed and right-handed options.
• Sharp/flat support: Handles both # (sharp) and b (flat) notes for the root.
• Circle direction: Supports both clockwise and anticlockwise navigation in the circle of fifths.
• Triads & sevenths: Option to display triads and 7th chords in the circle of fifths.
• Sync with metronome: Play guitar chords or piano chords in time with the metronome beat.

Benefits

• Music composing: Helps composers discover both basic and advanced chords that can work across any scale or mode.
• Music theory study: Great for learning scales and chords across almost all available heptatonic scales and modes, with included music theory articles that can act like a free theory guide.
• Circle of Fifths: Covers all scales and modes, including triad and seventh chords—one of the most commonly used theory tools.



• Chord Finder: Lets you locate all possible chords for the scales and modes included.
• Chord progressions: Uses the Circle of Fifths tool to derive progressions for supported scales and modes.
• Modulation / key change: The Modulations tool provides multiple options for shifting keys.
• Voice leading: Try different voice-leading approaches using Cube Dance.
• Guitar & piano chords: Displays chords visually on both the guitar fretboard and the piano keyboard.
• Vocal training: Supports singers with practice via the Scale Practice tool.
• Ear training: Interval practice helps musicians strengthen listening skills.