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How did electronic and chance music change the traditional idea of the concerto?

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caricature of Antonio Vivaldi — concerto Caricature of Antonio Vivaldi, pen and ink on paper by Pier Leone Ghezzi, 1723; in the Codex Ottoboni, Vatican Library, Rome. The inscription below the drawing reads, “Il Prete rosso Compositore di Musica che fece L'opera a Capranica del 1723” (“The red priest, composer of music who made the opera at Capranica [College in Rome] of 1723”).

From 1950 onward, the rise of electronic music and aleatory music (or chance music) significantly altered the traditional concept of the concerto. These avant-garde movements largely dismantled the conventional features associated with the genre, including its very title.

The traditional concerto was defined by a specific relationship between a soloist and an orchestra. As composers began incorporating electronic processing—such as tape manipulation or live electronic sounds—and indeterminate elements where performers make spontaneous choices, the rigid structure of the concerto dissolved. In many cases, the only remaining identifiable characteristic was the basic idea of a group-solo relationship, as seen in works by composers like Karlheinz Stockhausen and Lukas Foss.

While these innovations challenged the historical form, this fundamental concept of the soloist interacting with a larger ensemble proved resilient, surviving into the 21st century as an essential element of musical expression.12