Built for working musicians
Any song into a
Nashville Number chart
in seconds.
Drop in an audio file or paste a YouTube link. Tonic detects the key, locks the tempo, and lays out the chord progression in clean NNS — ready to edit, save, and print before the downbeat.
No credit card required.
Built for the way Nashville actually charts
Numbers instead of chords. Diamonds, pushes, splits, and section marks — all the shorthand the session world runs on. Transpose with a single key change and the whole chart moves with you.
- Automatic key + tempo detection
- Chord recognition straight from the audio
- Editable measures, beats, and sections
- Print-ready layout for the bandstand
- Save and revisit your chart library
From audio to chart in three steps
Stop transcribing by ear. Let the analysis do the first pass.
Upload or link
Drop an MP3/WAV or paste a YouTube URL. Tonic handles the rest.
Auto-analyze
Key, tempo, and chord progression — detected in your browser.
Edit & print
Refine the chart, save it to your library, print a clean copy for the band.
Ready to chart your next song?
Free to start. No credit card. Charts saved to your library.