Why Does Double-Note Legato Need a Priority Line?

When a double-note passage is marked legato, an adult learner may assume that both notes must be joined by the fingers without any gap at all. The hand then stretches and holds, the wrist stiffens, and the fingering becomes distorted in the effort to keep everything connected. The difficulty is not always hand size. Often the two voices have not yet been given an aural priority.

Every piano tone begins to decay as soon as it sounds. A sense of legato comes from the way neighbouring sounds meet; it does not require every key to remain physically bound to the next. If the upper voice carries the melody and the lower voice supplies harmony, keep the upper line finger-legato first. The lower note may release very briefly, provided it does not create an audible break. Finger substitution or a slight overlap can help in some places. Pedal may complete the resonance, but it should not erase the boundary between the voices.

Practise each line alone long enough to hear which one damages the phrase when its connection is lost, then return to the double notes. Listen for two things: whether the melody still travels forward, and whether the release below produces an accidental accent. Complex piano movement is organised around a musical goal; it is not a test of abstract finger independence. Good double-note legato therefore does not grip every note equally. It preserves the sound that most needs continuity and arranges the remaining movements around it.

https://arxiv.org/abs/2410.05791

To keep this kind of voicing decision inside a consistent practice routine, <a href="https://apps.apple.com/us/app/scoreflow/id6796205656">ScoreFlow</a&gt; can keep the score and practice materials together for repeated comparisons of the same passage.