The Circle of Fifths Clock

The Circle of Fifths clock tells time with sound using the music theory of the Circle of Fifths. The clock will help train your ears to hear pitch and will make sense to those who can already do so. The 12 tones of the diatonic scale correspond with the 24 hours of the day. Every half hour, music sounds and the waveform of the music is displayed on a screen. The clock is structured so that one complete and complete piece of music is played every day. It is inspired in part by the Winchester chimes I used to hear at my grandparents’ house. Winchester chimes resolve musical tension over the course of the hour, while the Circle of 5ths clock resolves tension over the course of a day. The music for the clock was played on my 1954 Martin 00-18G.

The Circle of Fifths, which works in a clockwise fashion and is sometimes known as the Cycle of Fifths, explains the relationships between the 12 tones of the chromatic scale. It shows patterns that composers use to write music. The Circle of Fifths is so powerful that anyone without any understanding of music except for the chart below and the relationships it describes could write a beautiful piece of music. Simply explained, any note on the circle is the major fifth of the previous note in the cycle. However there are many other ways to explain the circle. Every casual musician should know it.

The clock works by playing the chord associated with a given note in the circle every hour. C major, generally considered the root of music, is a happy chord and represents 12:00 noon. The rest of the p.m. hours are represented by the rest of the notes that complete the major circle (G = 2, D = 3, and so forth). The A minor chord is more somber and represents midnight. The a.m. hours grow more intense with minor chords leading up to noon/C major.

The half-hours are marked by a I/V cadence, which gives a sense of the day progressing as one long musical piece. The V which finishes most cadences is the chord that will be played at the top of the next hour. 11:30 a.m. is the only half-hour that is not represented by a I/V cadence. This time begins the transition to 12:00 noon and C major, so we need a ii/I cadence here from D minor to C major. Since ii/I is not a very strong resolution, the piece is actually infinite - as infinite as time itself!

This clock can be installed on any computer running Java and connected to a screen. The current time in milliseconds is shown on the bottom right of the clock. This clock is in the proof of concept stage and is currently in development. Hopefully now people will start saying, “Drinks at B major!”, or maybe “B is for beers!”

jberry.net/clock

the clock

the circle of fifths