Second-inversion chords with the fifth of the chord in the bass, also known as $$\left.\text{}^{6}_{4}\right.$$ chords, are special chords found only in four situations in classical music.
2. Passing six-four: the bass line will look like a passing-tone figure, with three stepwise ascending or descending notes, and the middle chord will be a $$\left.\text{}^{6}_{4}\right.$$ chord
3. Pedal six-four: the bassline will consist of three repeated notes, and the middle chord will be a $$\left.\text{}^{6}_{4}\right.$$ chord.
4. Melodic bass six-four: in this situation, the bass voice has the melody; when the fifth of the chord occurs in this bass voice melody, the result will be a $$\left.\text{}^{6}_{4}\right.$$ chord.