Electric instruments such as the electric guitar, the electric bass and the ondes Martenot appear occasionally in the classical music of the 20th and 21st centuries. Both classical and popular musicians have experimented in recent decades with electronic instruments such as the synthesizer, electric and digital techniques such as the use of sampled or computer-generated sounds, and instruments from other cultures such as the gamelan.

What type of instrument appears occasionally in the 20th and 21st century styles of classical music?