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MusicCircles is an app that can help you understand the deep relations between notes and chords in western music. Through the Circle of Fifths, which spans all the semitones in the octave, you can select any mode and key, and quickly find out its key signature, the members of the scale, the chords associated with the scale and look at the chords in a piano keyboard or guitar fretboard.

You can also hear the individual notes or the chords, to hear how they go together to form harmonic progressions.

This app can serve both the serious music student and the enthusiast as it integrates all the fundamentals of harmony in a concise, simple to use yet powerful interface.

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