Free · No sign-up · 2-minute workouts
Theory is a muscle.
Train it.
Short, repeatable drills that turn keys, intervals and chords into reflexes, plus free tools to transpose, find chords and look up scales.
Guided training
The training plan
New to this? Follow the plan: one short session a day, from your first note to jazz harmony.
33 programs · 4 stages
Learn music theory step by step
Each program is a short course: a lesson, drills and a test every day. Finish one and the next picks up where it leaves off. Know some already? Skip ahead.
The Keyboard
Find any note on the piano without counting. Where everything starts.
Reading Music
The staff, treble and bass clefs, ledger lines, sharps and flats, and key signatures.
Rhythm Basics
Beat, note values, time signatures, dots, ties, rests and counting a bar.
See the whole training plan, all 33 programs →
Make it yours Already know the basics? Richer chords, substitutions, bass lines and changing a song's mood.Open →Sing in harmony Beta Learn to sing a second part: thirds, fifths and chord notes, with microphone practice.Open →Practise
Drills
Short games with instant feedback. Play endless, or beat the clock.
Piano Keys
Which key is which note? Learn the keyboard in minutes.
Staff Reading
Read the treble and bass clef: name notes, place them, and read key signatures.
Rhythm
Count it, read it, hear it: note values, rests, bars and time signatures.
Interval Builder
Name any interval and build the note it lands on, with the keyboard to prove it.
Triads
The four triads, how they are built from thirds, and a drill to know them.
Name That Key
See a chord progression. Name its key.
Your daily routine
My Gym
A 5 or 10 minute routine built from what you have learned: weak spots more often, strong ones less. Plus your stats and progress.
The toolbox
Tools & charts
Look things up fast: transpose, find a chord, check a key.
Chord Transposer
Paste a song with chords. Change the key.
Capo Calculator
Which capo fret gives you the easiest chords?
Metronome
A steady click for practice, with tap tempo to find the speed of any song.
Tuner
Tune guitar, ukulele, bass, violin or any note, with your microphone.
Scale Finder
Tap your notes. See every scale they fit.
Chord Finder
Tap the notes to name the chord, or look up a chord's notes.
How it works
- 1
Pick a workout
Each one targets a single skill — keys, transposing, chords. Two minutes is plenty.
- 2
Do your reps
Big buttons, instant feedback, and a reason for every wrong answer.
- 3
Build the streak
Streaks and accuracy are saved on your device. No account, no email, no catch.
Why drills beat reading
Knowing that F♯ major has six sharps is trivia. Naming the key of a progression in under two seconds is a skill — and skills come from repetition. MusicTheoryGym gives you the reps: tiny, focused, and immediate.
- ▸Spelling done right. G♯ and A♭ are not the same note on the page, and the drills respect that.
- ▸Learn from misses. Every wrong answer tells you why, not just that it was wrong.
- ▸Private by design. No accounts. Progress lives in your browser.