Interactive Demo
The Harmonic Compass: Major Scale Explorer
The Harmonic Compass: Major Scale Explorer is a free, interactive learning demo from the AP Music Theory course on Lykke. It helps you build intuition for Pitch and Pitch Notation, Major Scales and Scale Degrees, Key Signatures and the Circle of Fifths, Simple and Compound Meter. Play with it directly in your browser — it features direct drag interaction. This demo lives in the “Unit 1: Music Fundamentals I: Pitch, Major Scales and Key Signatures, Rhythm, Meter, and Expressive Elements” section of the course.

How to use this demo
- Click and drag directly on the canvas to manipulate the scene.
- Experiment freely — there's nothing to break, and every change is reversible.
What you'll explore
- Pitch and Pitch Notation
- Major Scales and Scale Degrees
- Key Signatures and the Circle of Fifths
- Simple and Compound Meter
- Rhythmic Values and Beaming
- Dynamics and Articulation
Frequently asked questions
What does the The Harmonic Compass: Major Scale Explorer demo do?
This unit covers the essential building blocks of music notation and theory, focusing on the major scale system and the fundamental organization of time through rhythm and meter. The Harmonic Compass: Major Scale Explorer turns that idea into something you can manipulate directly and watch respond.
What AP Music Theory concept does The Harmonic Compass: Major Scale Explorer teach?
This unit covers the essential building blocks of music notation and theory, focusing on the major scale system and the fundamental organization of time through rhythm and meter. It focuses on Pitch and Pitch Notation, Major Scales and Scale Degrees, Key Signatures and the Circle of Fifths, Simple and Compound Meter, Rhythmic Values and Beaming, Dynamics and Articulation from the “Unit 1: Music Fundamentals I: Pitch, Major Scales and Key Signatures, Rhythm, Meter, and Expressive Elements” section.
What can I control in The Harmonic Compass: Major Scale Explorer?
You can drag elements directly on the canvas. Every change updates the visualization in real time, so you can see exactly how each variable affects the outcome.
How does The Harmonic Compass: Major Scale Explorer fit into the AP Music Theory course?
AP Music Theory is an introductory college-level course that develops students' understanding of music through the analysis of performed and notated works. The curriculum integrates written theory with aural skills, cov… This demo is the interactive piece for the “Unit 1: Music Fundamentals I: Pitch, Major Scales and Key Signatures, Rhythm, Meter, and Expressive Elements” section. Open the full AP Music Theory course wiki at https://www.getlykke.com/explore/public/ap-music-theory-64526a5a-2b9d-4c74-956a-c2957679aa84 for notes, flashcards, quizzes and the other demos.
What will I understand better after using The Harmonic Compass: Major Scale Explorer?
You'll build intuition for Pitch and Pitch Notation, Major Scales and Scale Degrees, Key Signatures and the Circle of Fifths, Simple and Compound Meter, Rhythmic Values and Beaming, Dynamics and Articulation — and, crucially, see how they behave when you change the inputs, which is hard to get from a textbook or lecture on AP Music Theory alone.
From the AP Music Theory course
This interactive demo is part of the Unit 1: Music Fundamentals I: Pitch, Major Scales and Key Signatures, Rhythm, Meter, and Expressive Elements section. Explore the full AP Music Theory course wiki on Lykke — with notes, flashcards, quizzes and more interactive demos.
Open the AP Music Theory course →