Interactive circle of fifths by Erik Nylund

This interactive circle of fifths includes many types of functionality:
Click the wheel to select the key.
Click on the chords to hear how they sound. In addition, you can switch between guitar and piano chords.
Hover over the scales to hear individual notes. The scale can be switched between major/minor and pentatonic.
In addition, you can create random chord sequences within the selected key.

The circle of fifths is created for the swedish National Encyclopedia's digital learning materials.
The file in its context is locked within the educational material so I cannot link to it. Therefore, I have posted it under my own domain.