Second Inversion of Triads

Complexity : 2/10 (simple)

A chord is said to be in its second inversion, when the 5th from the root is in the bass.
- Two types need to be considered - cadential and passing.

Cadential Second Inversion
Only 2 are possible - Ic and IVc. They move to V and to I respectively on the same bass. The resolution must not be more strongly accented than the cadential second inversion.
These chords should NOT be approached by leap from the first inversion of another chord.
Uses of Ic
- This can be used as the first chord in a half-close, Ic-V.
- This can precede V in an interrupted or a perfect cadence. Of course, rhythm considerations set above must be met.
- Dominant of scale in S or B, lasting for 2 or more beats at a half or full close, must be harmonized as Ic-V, to avoid too long a halt.

Use of IVc Cadential
This may be used to decorate a perfect or a plagal cadence provided the final tonic bass lasts at least 3 beats. Its use is not very frequent.

Passing Second Inversion
Only IC and Vc are possible. The bass is approached and quit by step and the second inversion is always on the weak beat. Ic lies between IVa and IVb, and Vc will lie between Ia and Ib.