Crescendo

Crescendo, abbreviated cresc. or shown with the wedge-shaped ‘hairpin’ symbol (<), instructs the performer to increase the volume gradually over a span of music. It is one of the most fundamental expressive devices in Western music.

The duration of a crescendo can range from a single beat to many bars. A short crescendo intensifies a phrase; a long one builds structural tension across a whole section. The starting and ending dynamics are often specified — for instance, p under the start of the hairpin and f at the end.

The rate of growth must be planned. A crescendo that arrives at the peak too soon has nowhere to go; one that delays too long sounds tentative. Conductors and section leaders shape crescendos by gesture; soloists must internalize the curve. The ‘Rossini crescendo’ — a long, slow, escalating wall of sound — became a structural principle in 19th-century opera and is one of the most thrilling effects in the repertoire.

Italian, gerund of crescere (‘to grow, increase’), from Latin crescere.

Plan the curve. Identify the start and end dynamics, then calibrate where you should be at the midpoint. Avoid the common mistake of starting too loud — the start must be quiet enough to allow the full growth.