Learn songs structurally
Chord Lab
The same chords, on two instruments. See the shape. Hear the pattern.
Chord Calculator
Chord plays piano notes together or strums guitar. Arpeggio plays from low to high. Applies to chord previews and the progression.
Piano · click or tap to play
Green marks the chord notes to play, from low to high.
Play individual notes or tap several keys to hear them together.
Chord Finder
Know a note in the song, like F♯? Tap it below, then add any other notes you know to narrow the possibilities.
Choose at least one note to see possible keys and chords.
♯ means sharp; ♭ means flat. F♯ and G♭ are two names for the same piano key. Selecting a note plays it.
Possible keys
Each pair shares the same seven notes. Try a key to hear its home chord and load its Chord Family and Common Progression below.
These are matches, not a detected key. Fewer key-signature accidentals appear first, not more likely keys. Listen for which note or chord feels like home.
Could these notes belong to one chord?
If the notes belong to the same chord, try these triads, seventh chords and add9 chords. Shorter matching chords appear first. Notes from different parts of a song need not fit one chord. These buttons preview piano chords.
Chord Family
Chords in C major
Uses the calculator’s root and the scale above. These are basic three-note chords. Adding a seventh or ninth in the calculator does not change this scale.
Inversions change the order of the notes, so the chord family stays the same.
Common Progression
C → G → Am → F
I → V → vi → IV
Four chord shapes, one repeating pattern.
Song Decoder
Start with a YouTube music link
Turn an arrangement into chords, sections and repeating shapes you can learn.
This page prepares an analysis request to paste into chat. It does not listen to or automatically analyze YouTube videos. Exact arrangements may need audio, sheet music or screenshots.
The structure to look for
Copy this into your chat, then use the calculator to explore the chords you find.