Practice radio · live synthesized changes
An endless stream of changes to play over: ii–V–Is, turnarounds, blues, rhythm changes and Coltrane cycles, moving through all twelve keys. The current chord and its scale are drawn live on piano and guitar, and you can see the next key coming. Pick a station, press play, and practise for as long as you like — nothing repeats the same way twice. Switch to Ear training to name keys and chord qualities by ear, or Call & response to trade two-bar phrases with the band.
Now playing
Chord
Up next
Which key is this cadence in?
Each chorus is one pass through the form; the station then moves key (a fourth up, at random, or not at all). Audio is synthesized in your browser and keeps playing in a background tab. Theory and original audio only — no copyrighted tunes.
How to use it
Comp first, then blow. Start on “Everything” with the lead line off and just play chord tones on the strong beats. When that's easy, switch the lead line to Arpeggios and copy it, then to Scales.
Use “Stay in key” to woodshed one key, then flip to Circle of fourths to test whether it transfers. Random is the honest one — it's what a jam session feels like.
Watch “Up next.” Knowing the next key a chorus early is exactly the skill you need on a bandstand. When you stop needing to look, hide the diagrams.
Everything on the radio has a page of its own. Scales: 17 scales in every key. Chords: arpeggios and voicings. Theory: what a ii–V–I is, chord-scale theory, practising in twelve keys.
Want to slow one form down and study it? Every progression has its own page: ii–V–I, turnaround, jazz blues, rhythm changes, Coltrane changes.
Common questions
An endless, in-browser stream of practice changes. It plays a vamp (bass, comping, click) through a progression, then moves to the next key or form, so you can improvise for as long as you like without stopping to set anything up. All audio is synthesized live — nothing is recorded or copyrighted.
It never repeats the same way twice, it shows the current chord and chord-scale on piano and guitar as it plays, it tells you what is coming next, and you choose how keys travel: around the circle of fourths, at random, or staying in one key.
Ear training plays a cadence in a hidden key (or a single chord) and asks you to name it — twelve key buttons, or the five chord qualities — keeping a streak. Call & response runs the vamp and, every four bars, plays a two-bar phrase from the current chord-scale and then leaves two bars for you to answer.
Major and minor ii–V–I, the I–vi–ii–V turnaround, the 12-bar jazz blues, rhythm changes (A section and bridge) and Coltrane changes — all as generic Roman-numeral forms.
Yes. The audio scheduler runs independently of the page being visible, so you can keep a chart or a tuner open in another tab.