Songwriting
Key finder.
Click the chords you already know belong in your song. This works out which keys they could all fit in, then shows you the rest of the chords in that key and the strongest notes to build a melody or solo around.
How this helps. Say you know your song starts on Am7, but you have no idea where to take it next. Click Am7 below. You will get every key that chord genuinely belongs to. Click a second chord, say F major, and the list narrows to only the keys that contain both. Keep going, and by two or three chords you usually land on one or two real candidates, along with the rest of that key's chords and the notes that will sound strongest if you solo or write a melody over it.
Click the chords you know
Chords you have picked
Pick at least one chord to see the possible keys.
You have the key, now write something with it
Knowing which chords belong together is the start. Turning them into a riff, a melody, or a solo is the next part.
What this does not do
This finds the keys that best fit the chords you enter. Borrowed chords, key changes, and incomplete progressions can leave more than one honest answer.
What to do with the result
Use the top result to organize the chords and test the expected home chord by ear. If the progression never settles there, contains borrowed chords, or changes tonal center, keep the alternate results instead of forcing one answer.
Last reviewed: August 2026