Interpolation (also known as replayed), especially 20th-century music and later, is an abrupt change of musical elements, with (almost immediate) resumption of the main theme or idea. Pieces that are cited as featuring interpolation, among other techniques, are Music for Brass Quintet by Gunther Schuller and Threnody to the Victims of Hiroshima by Krzysztof Penderecki, both 1960–61.