Comparisons
Finger glissando--sliding from a sharp to a natural key by any of the five fingers to achieve a legato connection--is relatively economical. It requires only a tiny movement of a single finger as it slides off the sharp onto the natural key. But it sometimes fails to deliver a perfect legato. Instead, an over-legato or non-legato results as the finger “drags” or “hops” from sharp to natural.
If direct fingering or redistribution are possible, they will provide more security than finger glissando. The raised surface of the sharp key sets up an excellent opportunity for finger crossing, which might also be preferable. Whenever the thumb moves from sharp to adjacent natural key, use the tip of the thumb only, in which case it becomes a finger glissando, not a thumb glissando. Substitution uses much more motion than finger glissando.
