La in the Bass

Scale degree 6̂ (la) in the bass signals one of several harmonies, and identifying the right one requires attention to the upper voices. The most common chord with 6̂ in the bass is vi — the submediant triad in first position — but 6̂ also appears as the bass of IV⁶ (subdominant in first inversion) and as the bass note under certain passing or neighbor harmonies. Each creates a different functional context despite sharing the same bass pitch.

The submediant chord (vi in major, VI in minor) has tonic function: it shares two pitches with I and can substitute for the tonic in a deceptive cadence (V moves to vi instead of I). When vi appears mid-phrase, it often prolongs the tonic area or initiates a descent from the tonic toward the predominant. In minor, the major VI chord (♭6̂–1̂–♭3̂) is particularly characteristic and lends a modal warmth to the progression.

IV⁶ — the subdominant with 6̂ in the bass — has predominant function despite having the same bass pitch as vi. The distinction lies in the upper voices: IV⁶ contains 4̂ and 1̂ above 6̂ in the bass, while vi contains 1̂ and 3̂. The bass note 6̂ in IV⁶ descends by step to 5̂ under the dominant, making it a smooth, stepwise-approaching strong predominant. Learning to hear whether 6̂ in the bass sounds like a tonic substitute (vi) or a predominant approach (IV⁶) is a crucial skill for accurate harmonic hearing and analysis.