Mu chord

A mu major chord or mu chord (signified by μ) is a particular voicing of an add 2 or "add 9" chord. It is formed by adding a major second to a major triad. The voicing is associated with jazz-rock band Steely Dan. The mu major chord differs from a chord, as suspended chords do not contain the major (or minor) third.
Origins
The reference to this chord as "mu major" has been popularized by fans of the jazz-influenced rock group Steely Dan, as well as by the band members themselves. This chord is used extensively in their work, often arpeggiated at the end of musical phrases. The "mu major sound" is a distinctive idiom of Steely Dan's style. In a 1989 interview with Paul Zollo, Walter Becker explained that the use of the chord developed from trying to enrich the sound of a major chord without making it into a "jazz chord". In the Steely Dan Songbook, Becker and Donald Fagen state that "inversions of the µ major may be formed in the usual manner with one caveat: the voicing of the second and third scale tones, which is the essence of the chord's appeal, should always occur as a whole tone dissonance."
Theory
The chord consists of a major triad with an added major second note. When the chord is voiced with the third in the bass, the presence of two stacked fourths in the upper register, between the second and the fifth, and the fifth and the root, gives the chord a quartal harmony flavour. The chord can also be voiced with the ninth (or second) in the bass, although such voicings are generally known as slash chords. It is suggested that the chord was conceived on or for use on keyboards.

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