The Circle of Fifths Music Theory Songwriting Tool by tooz & t
helps you explore Music Theory in a fun, interactive way.
See the relationship between Notes, Scales, Chords and Keys.
Learn how to Build Chords,
Chord Progressions, and Transpose Keys — Instantly.
For songwriters, producers, and curious musicians of all levels.
★ ★ ★ ★ ★ "The WHEEL is REAL."
Seven Stepping Stones.
From Learning a Single Note, to Writing an Entire Song.
12 notes. The building blocks of all music. Learn their names, their relationships, and the distance between them.
Start Here →The major scale formula. Build it in any key. Find the 7 chords hiding inside.
Available NowWhy chords feel happy, sad, or tense. The emotional code of music.
Available NowWrite your first 4-chord progression. The same one used in thousands of hit songs.
Available NowEvery major key has a twin. Same notes, different mood. Double your palette.
Available NowBreak the rules. Borrow chords from other keys. Add depth and surprise.
Available NowBring it all together. The complete workflow — from blank page to finished song idea. Vibe, key, progression, melody, structure.
Finish Strong →Learn by doing. Each tool brings a concept to life.
Interactive wheel showing all 12 keys, signatures, chords, and relationships. Click any key to explore.
Open ToolPick any root note. Build the major scale step by step. Hear each note.
Open ToolClick chords. Build progressions. Hear them instantly. In any key.
Open ToolSwitch between major and relative minor. Hear the mood shift.
Open ToolHear the difference between in-key and borrowed chords.
Open ToolThe full blueprint. Vibe, key, progression, melody, structure.
Open ToolAnalyze real progressions from pop, rock, jazz. Guess the key. Unlock the theory behind the emotion.
Open ToolVisualize the fretboard. Connect scales, chords, and intervals directly to your instrument. See why the wheel matters for guitarists.
Open ToolClick to explore the fretboard
Real feedback from songwriters, producers, and curious learners.
"I been playing guitar over 50 yrs but I have never seen this or how it works! Something to learn from! "
"Very useful item! Thank you!"
"It’s a cool piece of kit for song writing and manipulation. Sturdy construction. Happy I got it."
Everything you've learned — every key, every scale, every chord family — on one visual tool. Instant. Tactile. Always ready.
Available now at your preferred retailer
Quick answers for curious minds.
Nope. The lessons start from zero. The Wheel puts the theory at your fingertips.
Yes. All the web content and lessons are free. The wheel is a separate physical product for those who want a hands-on tool.
All of them. Piano, guitar, bass, ukulele, DAW, voice — the theory applies universally. The wheel is instrument-agnostic.
Rotate the wheel to any key. The cutout window reveals the 7 chords in that key, plus the relative minor. No memorizing — just spin and play.
Great. These lessons reinforce what you already know and fills in gaps. The wheel speeds up your workflow and eliminates mental math.
