The circle of fifths
arranges the twelve notes of the chromatic scale in a circle.
The next note clockwise is a fifth higher.
This version displays the chords in every key.
There are twelve major chords (triads) shown with upper case letters
and twelve minor chords shown with lower case letters.
For each key the chords in that key are highlighted.
Major keys are in orange.
Minor keys are in blue.
In both cases the root (or I chord) is highlighted.
This first circle below can have it's key changed.
You can also change the key by clicking on the circle.
temporarily, just testing.
In this second circle below
the key changes every hour on the half hour.
Major keys (orange) during the day (5:30 AM to 5:30 PM).
Minor keys (blue) during the night (5:30 PM to 5:30 AM).
Set key selector when the cicle key changes (by click).