Tiny Instrument · Learn
A guided journey through music theory.
Start at the keyboard, not in a textbook. Nine chapters take you from your first key press through scales, intervals, chords, and harmony — each lesson building on the last.
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Comprehensive library of lessons.
Nine chapters and 38 lessons take you from the very first key press through scales, intervals, chords, and harmony. Every lesson builds on the last. You always know where you are and what comes next — no guessing what to study.
Interactive
Theory by playing.
Every concept is taught through action — you play the notes, hear the intervals, build the chords, and feel the ideas before they become abstract. Lessons are interactive exercises, not text to read and remember.
Guided
Guided and beginner-friendly.
Narration walks you through each step out loud. Guided retry means a wrong note prompts a nudge, not a dead end. Note labels, search, and visible completion progress are all on by default so nothing feels hidden.
Sandbox
Play & Explore.
Alongside the structured chapters, Play & Explore opens up scales, modes, chord shapes, and technique in a less rigid, more sandbox-style layer. You can wander into it whenever the theory needs a more musical, hands-on context.
Concepts
Free micro-lessons on every topic.
Alongside the structured chapters, Concepts are short standalone lessons covering Scales, Harmony, Rhythm, Notation, Technique, and Keys. Each one is a focused read — perfect for looking something up without committing to a full lesson sequence. All free.
Theory Reference
Everything you need, always one tap away.
The built-in Theory Reference is a searchable index of scales, chords, intervals, modes, scale patterns, and more. Every entry links directly to related lessons so you can jump from looking something up to actually learning it — without leaving the app.
Music tags
Tap any tag to explore the concept.
Music tags appear throughout the app — on lessons, inside the Theory Reference, and in Aria's responses. Tap a tag like major or pentatonic-minor to jump straight to its full definition and related lessons.
Mixolydian
Major with a lowered 7th. Pattern: W–W–H–W–W–H–W. Bluesy and confident — the sound of blues and classic rock.
Ready to start learning?
Free to download on iPhone, iPad, and Mac.