Learn music theory by ear
Reading alone isn't enough.
28 tools 66 articles Free forever Every tool plays
28 tools and 66 articles. All in the browser. All make sound.
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Preview the Pachelbel progression
Tap to play
Step 1 — Which one are you?
Pick the shortest path to your goal.
neirocca has two learning paths — one for makers, one for listeners. Pick the closer match and the tool-plus-article order is set for you (you can switch later).
I want to start composing
6 core steps + 3 bonus to build chord progressions and melodies from scratch.
Does any of this sound familiar?
- Opened a DAW but had no idea what to type in
- Melodies come, but I can't fit chords under them
- I can cover songs, but I can't write original ones
I want to listen and understand deeper
6 core steps + 3 bonus to hear how your favorite songs are actually built.
Does any of this sound familiar?
- Can't pin down the key or chords of a song I'm hearing
- Words like 'mode' or 'borrowed chord' don't click
- The circle of fifths or key signatures still confuse me
Step 2 — Start here
Four tools to try first
Diatonic Chord Reference
Pick a key and see all 7 chords used in that key. Tap to play, color-coded by tonic / subdominant / dominant.
Open this toolChord Progression Player
20 classic progressions — Pachelbel, Royal Road, etc. Switch keys, tempo and instruments to compare.
Open this toolCircle of Fifths
Tap the circle to hear how keys relate, see accidentals, and feel V→I resolution — the key map every listener needs.
Open this toolScale Dictionary
Major, minor, pentatonic and 4 more — visualized on both piano and guitar, with ascending and descending playback.
Open this toolStep 3 — All tools
Browse all 21 tools
All 21 tools, grouped by theme. Tap any card and sound plays right away.
Melody Note Guide
Notes that fit each chord
Step Sequencer
8-row sequencer
Scale Dictionary
7 scales side by side
Mode Dictionary
Compare church modes
Circle of Fifths
Visualize key relations
Interval Calculator
Calculate intervals
Ear Training
Train your ear
Scale Converter
Reshape melody by scale
Nonchord Tone Lab
home.toolLeads.nctLab
Dictation Trainer
home.toolLeads.dictationTrainer
Transpose Tool
Transpose progressions
Key Finder
Estimate a song's key
Chord Progression Analyzer
Analyze T-SD-D
Inversion & Figured Bass Trainer
home.toolLeads.inversionTrainer
Roman Numeral Analysis Trainer
home.toolLeads.romanNumeral
Cadence Trainer
home.toolLeads.cadenceTrainer
SATB Part-Writing Checker
home.toolLeads.partWritingChecker
Form Viewer
home.toolLeads.formViewer
Articles
Learn theory by reading
What Are Diatonic Chords?
How the 7 chords usable in a key are built.
Read PopularTop 10 Essential Chord Progressions
From pop to jazz — the progressions you'll hear everywhere.
Read NewWhat Is Scale Conversion?
Map the same melody onto different scales and feel the mood shift.
Read Pairs with courseWhat Is the Circle of Fifths?
Visualize key relationships and get comfortable with modulation.
Read