György Ligeti in the context of "Extended vocal technique"

A concerto (/kənˈtʃɛərtoʊ/; plural concertos, or concerti from the Italian plural) is, from the late Baroque era, mostly understood as an instrumental composition, written for one or more soloists accompanied by an orchestra or other ensemble. The typical three-movement structure, a slow movement (e.g., lento or adagio) preceded and followed by fast movements (e.g., presto or allegro), became a standard from the early 18th century.

The concerto originated as a genre of vocal music in the late 16th century: the instrumental variant appeared around a century later, when Italians such as Giuseppe Torelli and Arcangelo Corelli started to publish their concertos. A few decades later, Venetian composers, such as Antonio Vivaldi, had written hundreds of violin concertos, while also producing solo concertos for other instruments such as a cello or a woodwind instrument, and concerti grossi for a group of soloists. The first keyboard concertos, such as George Frideric Handel's organ concertos and Johann Sebastian Bach's harpsichord concertos, were written around the same time.

A cello concerto (sometimes called a violoncello concerto) is a concerto for solo cello with orchestra or, very occasionally, smaller groups of instruments.

These pieces have been written since the Baroque era if not earlier. However, unlike instruments such as the violin, the cello had to face harsh competition from the older, well-established viola da gamba. As a result, few important cello concertos were written before the 19th century – with the notable exceptions of those by Vivaldi, C.P.E. Bach, Haydn and Boccherini. Its full recognition as a solo instrument came during the Romantic era with the concertos of Schumann, Saint-Saëns, Lalo and Dvořák. From then on, cello concertos have become more and more frequent. Twentieth-century composers have made the cello a standard concerto instrument, along with the already-rooted piano and violin concertos; among the most notable concertos of the first half of the century are those of Elgar, Prokofiev, Barber and Hindemith. Many post-World War II composers (Shostakovich, Walton, Ligeti, Britten, Dutilleux, Lutoslawski and Penderecki among others) have written at least one.