An example of a music #clock. Instead of associating time with numbers, each section of the day represents a note or scale. The face of the clock turns rather than the hand, so that the pattern of the scale is imprinted as a #mnemonic. The interface on the left shows the scales on a standard tuned guitar. The interface on the right is arranged in the circle of fifths. AM is major scale, PM is minor scale.
This music clock has the face turning, not the hands turning. The hour hand stays at noon. This clock will have the patterns of the scales to act as a mnemonic. Each section of the hour represents a note within a scale.