The Moodswinger is a twelve-string electric zither with an additional third bridge designed by Yuri Landman. The rod which functions as the third bridge divides the strings into two sections to cause an overtone multiphonic sound. One of the copies of the instrument is part of the collection of the Musical Instrument Museum in Phoenix, Arizona.
In March 2006 Landman was contacted by the noise band Liars to make an instrument for them. After 6 months he finished two copies of The Moodswinger, an electric 12-string 3rd-bridge overtone koto, one for guitarist/drummer Aaron Hemphill and one for himself. Although it closely resembles an electric guitar, it is actually a zither, as it has neither frets nor a proper neck. The pickup and electronics are built into the neck instead of in the body like usual electric guitars. In 2008 the Moodswinger II was released as a serial product. Jessie Stein of The Luyas owns a copy.
In 2009 Landman created a derivative version of the instrument called the Home Swinger, for workshops at festivals, where participants built their own copy within four hours. In 2010 the Musical Instrument Museum in Phoenix included a Moodswinger as well as a Home Swinger in their collection as two of the pieces of the Dutch section of musical instrument inventions.
The 3rd bridge divides the strings into two segments with different pitches. Depending on where the string is played, a bell-like harmonic second tone is created. The string resonates more or less when the back side is struck, depending on the position of the 3rd bridge along the string. This can be explained by acoustic resonance and microtonality. At harmonic nodal positions, the string resonates more than at other positions. For instance, dividing the string 1/3 + 2/3 creates a clear overtone, while 24/33 + 9/33 creates an indistinct overtone. The color dotted scale indicates the simple-number ratios up to the 7 limit (on the Moodswinger II to the 8 limit.) On these positions just intoned harmonic dyads occur.
The Moodswinger is focused on a non-atonal playing technique. A mathematical scale is added to specify 23 harmonic positions on the strings. Because the instrument has 12 strings, tuned in a circle of fourths, it is always possible to play every note of the equal tempered scale. However some positions have a + or - indication, because the equal tempered scale is not a perfect well-tempered scale.
The tuning of this instrument is a circle of fourths: E-A-D-G-C-F-A#-D#-G#-C#-F#-B, arranged in 3 clusters of 4 strings each to make the field of strings better readable.
Because of this tuning all five neighbouring strings form a harmonic pentatonic scale and all seven neighbouring strings form a major scale, available in every key. This allows a very easy fingerpicking technique without picking false notes, if the right key is chosen.
The instrument has 3 printed scales, used as guides for positioning the moveable third bridge and reading the played notes:
On the Moodswinger II the 1/8, 3/8, 5/8 and 7/8 are Blue dotted. On the Home Swinger the same color system occurs.
The sound of a 3rd-bridged string is a combination of 3 tones. A soft-sounding attack tone of the string part hit at the body side, the corresponding overtone of both sides and a resonating low fundamental tone of the counterpart of the string at the head side. The diagram below shows the tone combinations of the overtone (above) and the low tone of the counterpart (below). The attack tone is in most positions exact the same note as the overtone. Exceptions are 3/4, 3/5, 3/7 and 5/7. In the 3/... positions the overtone is a perfect fifth of the attack tone, in the 5/7 positions the overtone is a major third of the attack tone.
|Bridge position||Colour codes||Attack tone
related to open string
|Resonating fundamental of the counterpart 
related to open string
related to open string
related to fundamental of the counterpart
of string parts
Body : Neck
|1/16||Grey line||4 Octaves||Diatonic semitone||4 Octaves||Augmented fourth 21ma||111.73 : 4800.00|
|1/12||Green line||Just Perfect fifth 21ma||Lesser undecimal neutral second||Just Perfect fifth 21ma||Just Perfect fourth 21ma||150.64 : 4302.00|
|1/11||Yellow line||Greater septimal tritone 21 ma||Greater undecimal neutral second||Greater septimal tritone 21 ma||Just major third 21ma||165.00 : 4151.30|
|1/10||Orange line||Just major third 21ma||Just minor tone||Just major third 21ma||Just minor tone 21ma||182.40 : 3986.30|
|1/9||Red line||Just minor tone 21ma||Major second or Just minor tone||Just minor tone 21ma||3 Octaves||203.91 : 3803.90|
|1/8||Grey line||3 Octaves||Diminished third||3 Octaves||Just Major sixth 15ma||203.91 : 3600.00|
|1/7||Blue dot||Augmented sixth 15ma||Septimal minor third||Augmented sixth 15ma||Just Perfect fifth 15ma||266.87 : 3368.80|
|1/6||Green dot||Just perfect fifth 15ma||Just minor third||Just perfect fifth 15ma||Just major third 15ma||315.64 : 3102.00|
|1/5||Yellow dot||Just major third 15ma||Just major third||Just major third 15ma||2 Octaves||386.31 : 2786.30|
|1/4||Orange dot||Fifteenth||Just perfect fourth||Fifteenth||Twelfth||498.04 : 2400.00|
|2/7||Blue dot||Augmented sixth 8va||Augmented fourth or tritone||Augmented sixth 15ma||Just major third 15ma||582.51 : 1782.51|
|1/3||Red dot||Twelfth||Just perfect fifth||Twelfth||Octave||701.96 : 1901.96|
|2/5||Yellow dot||Just major third 8va||Just major sixth||Just major third 15ma||Just Perfect fifth 8va||884.36 : 1586.31|
|3/7||Blue dot||Septimal minor third 8va||Augmented sixth||Augmented sixth 15ma||2 Octaves||968.83 :1466.87|
|1/2||Grey dot||Octave||Octave||Octave||Unison||1200.00 :1200.00|
|4/7||Blue dot||Augmented sixth||Septimal minor third 8va||Augmented sixth 15ma||Just Perfect fifth 8va||1466.87 : 968.83|
|3/5||Yellow dot||Just major sixth||Just major third 8va||Just major third 15ma||Octave||1586.31 : 884.36|
|2/3||Red dot||Just perfect fifth||Twelfth||Twelfth||Unison||1901.96 : 701.96|
|5/7||Blue dot||Augmented fourth or tritone||Augmented sixth 8va||Augmented sixth 15ma||Octave||1782.51 : 582.51|
|3/4||Orange dot||Just perfect fourth||Fifteenth or 2 Octaves||Fifteenth||Unison||2400.00 : 498.04|
|4/5||Yellow dot||Just major third||Just major third 15ma||Just major third 15ma||Unison||2786.30 : 386.31|
|5/6||Green dot||Just minor third||Just Perfect fifth 15ma||Just Perfect fifth 15ma||Unison||3102.00 : 315.64|
|6/7||Blue dot||Septimal minor third||Augmented sixth 15ma||Augmented sixth 15ma||Unison||3368.80 : 266.87|