A thirteenth chord "collapsed" into one octave results in a dissonant, seemingly secundal[1] tone cluster. Created by Hyacinth (talk) 22:18, 5 July 2009 using Sibelius 5.
Harmonic seventh chord on C. Equal tempered major chord with quarter tone flat minor seventh (950 cents). Created by Hyacinth (talk) 18:56, 10 November 2011 with Sibelius 5.
Bridge chord, named after en:Frank Bridge. Minor chord with a major chord a whole tone above. Chord pictured followed by arpeggio with D major at the octave.
Diagonal barre chord: major seventh chord on G. The first finger fingers both the second fret on the first four strings and the third fret on the sixth string.