Musicians usually draw the circle of fifths as a circular chart with 12 so-called stops, like a clock. Clockwise, each key is shown a perfect fifth apart. For example, C is followed by G, which is followed by D. A specific number of accidentals -- sharps and flats -- represent each key, starting with no accidentals. As the circle progresses from one key to the next, an additional accidental is added or subtracted. If you view the circle of fifths counterclockwise, then each key progresses by a perfect fourth instead of a fifth.
Recognizing the patterns in the circle of fifths chart might help you memorize the order of sharps or flats in a key signature. As the circle progresses clockwise, it adds one sharp to each key. As the chart progresses counterclockwise, it adds one flat to each key. A circle of fifths chart will also show the pattern of accidentals located on the music manuscript paper.
Because many composers incorporate the circle of fifths into their compositions, it's helpful for instrumentalists to practice them. Practicing the circle of fifths also helps with understanding modulation, and performing in remote keys. A useful way to practice the circle of fifths is to play the progression in a familiar key, then gradually move to less familiar keys. Those studying jazz must practice the progression using various voicing, such as seventh chords or ninth chords.
The circle of fifths is in many types of music, especially jazz and classical music. Songs that jazz musicians perform frequently have passages containing the circle of fifths. A few examples include "I've Got Rhythm" by George Gershwin and "Heart and Soul" by Hoagy Carmichael. The circle of fifths is in most types of classical music composed after 1600. Baroque period composers, such as J.S. Bach and Antonio Vivaldi, were especially fond of using it in their compositions.