Music Time clock Patented dial is the "circle of fifths",
textbook chart of "perfect fifth" intervals.
Truly the "key to the keys," it shows how many sharps
or flats go with each of the 12 major and minor keys.
Guide to harmonic progressions and other patterns.
Clock makes it easy to master the circle of fifths
as a tool for understanding music's grammar.
Runs on one AA battery (not supplied)