A modern rendering of the Tonnetz. The A minor triad is in dark blue, the C major triad in dark red. Interpreted as a torus the Tonnetz has 12 nodes (pitches) and 24 triangles (triads). In musical tuning and harmony, the Tonnetz (German: tone-network) is a conceptual lattice diagram representing tonal space first described by Leonhard Euler in 1739. Various visual representations of the Tonnetz can be used to show traditional harmonic relationships in European classical music. (via Wikipedia)



















