+@node inversion
+@section inversion
+
+ES: ?,
+I: ?,
+F: inversion,
+D: ?,
+NL: ?,
+DK: ?,
+S: ?,
+FI: ?.
+
+When the bass is not the same as the root, the chord is inverted. The number
+of inversions that a chord can have is one fewer than the number of
+constituent notes. Triads, for example, (having three constituent notes) can
+have three positions, two of which are inversions:
+
+@table @strong
+@item Root position
+The root note is in the bass, and above that are the third and the fifth. A
+triad built on the first scale degree, for example, is marked @notation{I}.
+
+@item First inversion
+The third is in the bass, and above it are the fifth and the root. This
+creates an interval of a sixth and a third above the bass note, and so is
+marked in figured Roman notation as @notation{6/3}. This is commonly
+abbreviated to @notation{I6} (or @notation{Ib}) since the sixth is the
+characteristic interval of the inversion, and so always implies
+@notation{6/3}.
+
+@item Second inversion
+The fifth is in the bass, and above it are the root and the third. This
+creates an interval of a sixth and a fourth above the bass note, and so is
+marked as @notation{I6/4} or @notation{Ic}. Second inversion is the most
+unstable chord position.
+@end table
+
+