Mu major chord
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A "Mu Major" chord is a somewhat unconventional name for a "Major 9" chord, or an "add 2" or "add 9" chord. In other words, it is a chord constructed out of the 1,2,3 and 5th steps of the major scale. Often, it is voiced with the root (1) in the bass, and 2,3,5,1 in the upper register. Part of it's "sound" is the presence of two "stacked" fourths in the upper register, between 2-5 and 5-1. This is also called "quartal" harmony. It is softened by the presence of the major third.
The reference to this chord as "Mu Major" has been popularized by fans of the Pop/Jazz group Steely Dan, as well as 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.
A more detailed explanation available from: http://www.jmdl.com/howard/steelydan/mu-major.html