What key is this song in? Cobander listens and tells you.

Nobody wrote the key down, the bass player swears it's G, and the singer is straining on the chorus. Cobander hears the key from the recordings, shows it on the song, and can move the whole song to a better one.

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Free — the whole app, every song, forever. Intel Mac? Intel Mac download.

Cobander in one minute.

Hear the key from the takes

After the first takes land, Cobander listens to the recordings and the chords and names the key. If it isn't sure, it says so instead of guessing — and it offers the relative major or minor when the song could be either.

Songs that change key get a key per section, so the bridge that lifts a step up is labelled as its own key.

Move the song to a key that fits

Transpose the song up or down by half steps. The recordings are re-tuned, MIDI parts and chords move with them, and the drums stay put. Change one section only, or relabel a key that was named wrong without moving anything.

Only keys you can actually reach by shifting the pitch are offered, so you never end up with a song labelled one thing and sounding like another.

Know when a part is out of key

A warning chip shows up when a part doesn't sit in the song's key — handy when someone recorded their riff in E and the rest of the band is in F.

Questions

Does it work on a rough demo?

Yes. A guitar and a guide vocal are enough for it to hear the key.

Does transposing hurt the sound?

Small moves of a step or two sound natural. Big jumps change the character of a voice or a guitar, the same as any pitch shifter.

Is the audio sent anywhere?

No. Key detection and transposing run on your own computer.