--- title: "An AI music theory tutor | DuckyHelper" url: "https://duckyhelper.com/subjects/music/" description: "An AI music theory tutor that shows the sound: why a minor chord sounds sad on a labelled keyboard, how a string makes a note, rhythm in numbers. On a Mac." updated: "2026-10-09" --- Mac app # An AI music theory tutor that shows the sound DuckyHelper is an AI music theory tutor that explains the why behind what you hear. Ask why a minor chord sounds sad and Eddy puts the chord on a keyboard and labels the root and the minor third. Ask how a guitar string makes a note and you see the string vibrate, then pluck it with one button. Scales, intervals and rhythm work the same way, in the DuckyHelper Mac app. [Download for Mac](https://duckyhelper.com/download/)[Meet Eddy](https://duckyhelper.com/eddy/) [All films](https://duckyhelper.com/films/#robinhood-id) One question, shown ## Hear it. Then see why. Two questions our films ask, and what Eddy put on its desk for each. ### Why does a minor chord sound sad? Eddy shows a C minor chord on a keyboard and labels it as it explains: the root, then the middle note, a half step lower than in C major. That smaller gap, three half steps instead of four, is the minor third, and it is most of what you hear as sad. Change the picture ## Pluck it, slow it, zoom in Next to the bar, up to three round buttons change the picture in front of you, and Eddy explains what changed. Hover one to see its name. Picture edits are part of Plus and up. [Guide: edit buttons](https://docs.duckyhelper.com/eddy/edit-buttons/) ### Edit buttons For the guitar string they were Pluck the string, Slow the wave and Zoom into bridge. Each one changes the picture with a soft morph. ### Tap a part to ask Click any part of a picture, like the bridge or a key, and Eddy tells you about just that part. ### Choose how Eddy answers The chip at the left of the bar picks the answer: Eddy picks, Just words, Look it up, A picture or A scene. Music theory ## What you can ask about ### Intervals and chords Major and minor thirds, fifths, sevenths: where each sits on a keyboard and why it sounds the way it does. ### Scales and keys Why a major scale has its pattern of whole and half steps, and how key signatures follow from it. ### Rhythm in numbers Time signatures, note lengths and syncopation, worked out as fractions of a beat you can count. ### How sound works Strings, air columns and frequency: the physics behind pitch and why an octave doubles it. ## What it won't do ### Listen to you play The microphone is for talking to your tutor. Eddy does not hear or grade your instrument. ### Play the music for you Ask about a song and you get the theory and the picture, not a recording. ### Replace a teacher for technique Posture, tone and fingering need someone watching you play. Theory and ear questions are where it helps. ## Ask Eddy Say one of these out loud. Eddy picks how to show it: words, a picture or the board. What is rhythm, in numbers? What makes an octave? Quiz me on intervals [Download for Mac](https://duckyhelper.com/download/) ## How to use it [Guide: Your first lesson with Eddy](https://docs.duckyhelper.com/start/first-lesson/) ## Frequently asked questions ### Can an AI tutor teach music theory? Yes. Ask about intervals, chords, scales or rhythm and Eddy explains out loud and shows it: a chord on a labelled keyboard, a string vibrating, rhythm counted as fractions of a beat. A quick quiz afterwards checks it stuck. ### Can it hear me play an instrument? No. The microphone is for talking to your tutor, and Eddy does not listen to or grade your playing. Use it for the theory behind what you play, and a teacher for technique. A minor chord's middle note is a half step lower than in the major chord on the same root: three half steps above the root instead of four. That smaller interval, the minor third, is most of what makes it sound darker. Ask Eddy and it shows it on a keyboard. ### Does it work on a Chromebook? Not right now: DuckyHelper is a Mac app (macOS 14 or later, Apple silicon). There is no Chromebook or web version. In the Mac app, made pictures and picture edits are part of Plus and up, and [Pricing](https://duckyhelper.com/pricing/) shows what each plan includes. ## More subjects ### Math: worked steps, moving graphs, and hints before the answer An AI math tutor that explains one move at a time: worked steps, graphs you can move, hints before answers. 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Tap any part to ask about it, or change it. ### Every subject: one question per subject, shown on screen DuckyHelper is an AI tutor for any subject: math, the sciences, history, writing, languages, code, music and art, each explained out loud and shown on screen. ## Ask why it sounds that way Get the Mac app, open the Eddy tab and ask your music question out loud. [See what it does](https://duckyhelper.com/features/) The Mac app needs Apple silicon and macOS 14 Sonoma or later. There is no Chromebook, Windows or web version right now.