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Music is, in a way, very mathematical and i would like, as a composer, an intuitive visualization of intervals to be able to play with them. I found that quality in the circle of fifths.
bq. It is a geometrical representation of relationships among the 12 pitch classes of the chromatic scale in pitch class space. Musicians and composers use the circle of fifths to understand and describe those relationships.

For now it’s already used for scale representation (the major scale is a simple half-circle), key signatures and harmonic purposes. In harmony it’s common to move for chord to chord by a fifth, just think of the II V7 I jazz licks or I IV V blues pattern. But i would like to promote circle of fifths’ use for representing chords, phrases, songs and music theories.

See these examples (you may need adobe’s plugin to visualize) :

• Major chord : Minor chord :
• Schoenberg’s tonal region theory (work in progress)

I can see many steps in making a good set of c5(circle of fifths) tools :

• Allowing external sites to include an Embedded C5 in their webpages — is nearly done
• Making a Open Guitar Voicings Dictionary based on c5s — is what were working on
• Having a Interactive C5 to play with the math of music intuitively — is in project
• The sum of that may give birth to a kind of Open Phrases Dictionary to build songs in a social manner

Chosen technology to achieve c5 project is SVG for interface, Django framework and Chord Ontology for publishing data semantically