The
first inversion of a
chord is the
voicing of a
triad,
seventh chord, or
ninth chord with the
third of the chord in the
bass and the
root a
sixth above it. In the first inversion of a C-major triad , the bass is E—the third of the triad—with the fifth and the root stacked above it (the root now shifted an octave higher), forming the intervals of a third and a sixth above the inverted bass of E, respectively.