cadenza
A cadenza is a typically virtuosic solo passage in a concerto or similar work, played by the principal instrument without orchestral accompaniment. The term comes from the Italian word for cadence and originally referred to a moment of cadence or a free solo flourish that showcased the soloist’s technical and musical abilities.
Historically, cadenzas arose from a practice in which performers improvised highly elaborate sections to demonstrate skill
In standard concert repertoire, cadenzas most commonly appear in concertos, typically near the end of a movement
Notation practices vary: some cadenzas are fully written in the score, others are left open for improvisation,