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The most basic Circle Of Fifths has no inner ring. The center of the ring shows the key signature on a musical staff. The clef may be changed at any time to be the treble, bass, alto, or tenor clef.
The first inner ring display simply shows the number of sharps and flats in a particular key signature. (The number can also be obtained by simply counting the number of sharps and flats on the musical staff for the selected key.)
The second inner ring display shows the notes contained in the triad for a particular major key signature. (The notes can also be determined by using the musical mode inner ring display, selecting the key, and finding the notes that occur on the I, III, and V position next to the inner ring.)
The third inner ring display shows the relative minor key signature corresponding to its major key signature on the outer ring. The relative minor is always three positions clockwise on the circle from its relative major.
The fourth and most versatile ring display shows the note intervals per musical mode. All of the other convenience inner circle displays can be determined using the musical mode inner circle. For each mode, the interval is described by roman numerals. Roman numeral I is always at the tonic position. In the example below, the key of C# is selected in the dorian mode. The triad for C# is found by finding the notes next to the I, III, and V roman numerals (in the case of C# dorian, i-III-v). When the triad starts on an uppercase roman numeral, the triad is a major chord. When the triad starts on a lowercase roman numeral (as in the case of C# dorian), the triad is a minor chord. When the triad starts on a note with the raised circle, the triad is said to be diminished. The notes in the scale for C# dorian are all found along the inner mode ring, so you can construct the entire scale by starting at the root I position and observing the note names in sequence (I, II, III...). In the case of C# dorian, the notes are C# - D# - E - IV - G# - A# - B - C# (or i - ii - III - IV - v - viº - VII - i).
The final ring display shows a transposition assistant. The inside ring is the starting note or key and the outside ring is the transposed note or key. The example below is set to transpose from the key of F to the key of C. The note sequence of F-G-D-E in the key of F correlates to the sequence C-D-A-B in the key of C. Chords can also be similarly transposed. All chord qualities stay the same, only the root changes. For example, F major becomes C major. B minor seventh (Bm7) becomes F# minor seventh (F#m7).