The percussion section of the orchestra includes all instruments that are played by being struck, including the piano and celesta. Originally consisting of a pair of kettledrums or timpani, appearing normally with a pair of trumpets, in the orchestra of the later 18th century, a military importation, the percussion section was significantly enlarged with the allegedly Turkish fashion of the later 18th century, involving the occasional use of bass drum, cymbals and triangle in an imitation of the Janissary band. Liszt shocked audiences by including a triangle in the orchestration of a piano concerto, dubbed a triangle concerto by a hostile critic, and gradually other percussion instruments were added for occasional effects, including even, by Erik Satie, the typewriter.