The singing or playing of a long note so that it begins quietly, swells to full volume and then diminishes. It was originally (in the early 17th century) regarded as an ornament; some later writers call for it on all long notes. Though primarily a vocal effect, it was also used (and has been much over-used) by instrumentalists. It should not be confused with the term mezza voce, an instruction (meaning ‘half-voice’) to use a subdued tone.




