Key Companion

Key Companion – Wooden Scale and Chord Finder for Music Theory Practice

Bring music theory to life with the Key Companion, a hands-on teaching tool that makes scales, chords, and intervals instantly visible, understandable, and interactive. Whether you are introducing the circle of fifths, breaking down chord progressions, or helping students internalize interval relationships, this studio-favorite tool turns abstract theory into something tangible and fun.

Two Sliding Bars. One Powerful Visual

The Key Companion includes two custom sliders that work together to provide a full view of major and minor diatonic scales, chord functions, and interval relationships.

The scale bar displays both the major and minor scales in any key. It highlights the diatonic notes and shows Roman numeral chord functions underneath—helping students instantly connect the I, ii, iii, IV, V, vi, and vii° structure.

The  interval bar allows students to explore and count intervals directly on the scale. With built-in labels for M2, m3, M3, P4, P5, M6, m6, m7, and M7, students can track interval distances and compare interval qualities visually.
From scale discovery and theory analysis to warm-ups, songwriting, and improvisation—this one tool supports an incredible range of learning moments across ages and skill levels.

Product Info:

• Wooden tone grid with all 15 major and minor keys (7♯ to 7♭)
• Two sliding windows
• Scale bar: major/minor scales + diatonic chords
• Interval bar with labeled distances
• Portable, lightweight design for desks, group classes, or travel
• Crafted for durability and ease of use in busy music studios

Creative Uses

🎶 Key of the Week Exploration

Slide to a new key each week and explore the major and minor scales, chord functions, and common progressions. Great for building confidence in theory and key fluency.

🎼 Chord Progression Mapping

Have students slide to a key and build chord progressions using the Roman numerals as a guide. Perfect for harmonizing melodies and improvisation/composition activities

🔢 Interval Recognition & Comparison

Use the interval bar to visually compare whole steps and half steps, identify intervals by sight, or quiz students on melodic vs. harmonic intervals. 

🧠 Group Class Challenges & Theory Games
Set it up at a learning station and give students challenges like: “Find the key with 4 sharps and name all its chords,” or “Find the key of E major and build a I-vi–ii–V–I progression.”

🎵 Songwriting and Composition Aid
Students writing their own pieces can use the scale window to stay within key and the chord labels to choose harmonies. It supports creativity while reinforcing structure.

Why Teachers Love It
The Key Companion is everything a theory tool should be—visual, hands-on, easy to use, and packed with meaning. It removes guesswork, invites exploration, and supports your teaching goals without adding clutter to your lessons.
Whether used in one-on-one sessions, theory labs, group classes, or independent stations, this tool grows with your students and becomes a natural extension of the way they learn.
Simple. Intuitive. Endlessly useful.