At the end of the cadenza, the orchestra re-enters, and generally finishes off the movement on their own, or, less often, with the solo instrument.
It was later used in instrumental music, and soon became a standard part of the concerto. Originally, it was improvised in this context as well, but during the 19th century, composers began to write cadenzas out in full. Third parties also wrote cadenzas for works in which it was intended by the composer to be improvised, so the soloist could have a well formed solo that they could practice in advance. Some of these have become so widely played and sung that they are effectively part of the standard repertoire, as is the case with Joseph Joachim's cadenza for Johannes Brahms' Violin Concerto, Beethoven's set of cadenzas for Mozart's Piano Concerto no. 20, and Estelle Liebling's edition of cadenzas for operas such as Donizetti's's La fille du Rgiment and Lucia di Lammermoor.
Saxophonist John Coltrane, however, usually improvised an extended cadenza when performing "I Want To Talk About You", in which he showcased his predilections for scalar improvisation and multiphonics; the recorded examples (see "Coltrane Live At Birdland" and "Afro Blue Impressions"-- both live recordings) of Coltrane's "I Want To Talk About You" are approximately 8-minutes in length, with Coltrane's unaccompanied cadenza taking up approximately 3-minutes. More sardonically, Jazz critic Martin Williams once described Coltrane's improvisations on "Africa/Brass" as "essentially extended cadenzas to pieces that never get played." [1] Equally noteworthy is saxophonist Sonny Rollins' shorter improvised cadenza at the close of "Three Little Words" (from his album "Sonny Rollins on Impulse!").
Source: Wikipedia > Cadenza
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