Why Does Key Release Matter in Legato Practice?

When adults practise legato, attention easily narrows to whether the next note was pressed correctly. Yet the connection between two notes depends on the relationship between two moments: when the next key goes down and when the previous key comes up. Release the first too early and a gap appears; hold it too long and excessive overlap makes the line sticky. The pedal can prolong sound, but it cannot organise clear articulatory boundaries for the fingers.

Movement research with pianists has found that, in legato passages, one key is often released after the next has been depressed. When auditory timing was perturbed, players adjusted the local pace while broadly preserving the overlap between neighbouring tones. Another high-precision study found that fast, accurate performance was associated not only with key depression but also with key-lift timing and the upward motion of the key. These experiments mostly involved skilled pianists and specific tasks, however, so they do not prescribe one universal finger movement for every adult learner.

The practical implication is concrete. While playing a short phrase slowly, listen not only for the arrival of each note but also for the way the previous one ends. First practise without pedal and distinguish slight overlap, exact connection and deliberate separation. Then add pedal and check whether the fingers still articulate the phrase clearly. If a melodic line repeatedly sounds stiff, the problem may not be the force used to press the keys; the fingers may not know when to leave them. Legato does not mean extending every sound indefinitely. It means handing one note to the next with direction.

https://pmc.ncbi.nlm.nih.gov/articles/PMC3179864/
https://pmc.ncbi.nlm.nih.gov/articles/PMC9269260/