Every song has a theory.
Now you can see it.
Search any song and get an instant AI-powered breakdown of its key, chords, structure, and more, then create your own melody on top.
What you get
Everything about a song, decoded
Key & Scale
Discover the root key, mode, and scale of any song, and understand how they shape its mood and emotion.
Chord Progressions
See the chords behind the song with roman numeral analysis, chord names, and a breakdown of what makes the progression work.
Tempo & Rhythm
Get the time signature, BPM, and rhythmic feel, the pulse that drives the song's energy.
Song Structure
See how the song is built, intro, verse, chorus, bridge, with the chords and purpose of each section.
Theory Highlights
Uncover the hidden details, borrowed chords, modal shifts, melodic techniques, that make a song stand out.
Practice Studio
Play along with the song's chords on a virtual piano, sing over a backing track, get scored on your melody, and customize the drum pattern to your comfort level.
Share with Friends
Sign up free to share any analysis with a unique link, perfect for musicians, students, and bandmates learning together.
Export to MIDI
Download the song's chord progression as a MIDI file and load it straight into any DAW, perfect for production, practice, or remixing.
How it works
From search to practice in seconds
Search for any song
Type a song name and artist. Modalys searches a live music database so you always get the right track.
AI analyzes the music theory
Our AI examines the song and returns a structured breakdown, key, chords, rhythm, structure and highlights, in seconds.
Explore the theory
Dive into each section, key & scale, chord progressions, rhythm, structure, and theory highlights, at your own pace.
Practice & share
Head to the Practice Studio to play or sing along with the chords, get AI feedback on your melody, and jam with an editable drum pattern. Share the full analysis with friends via a unique link, free account required.
Start understanding the music you love
Free to use. No music theory background needed.
Get started free →