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
Click a chord above to start.
Pick at least one chord to see the possible keys.