- 20th century composers experimented with combining modern techniques with folk music from their home countries. In Eastern Europe, composers like Bartok and Prokofiev incorporated classical techniques and themes from Hungarian and Russian folk music respectively.
- Bartok and Prokofiev made extensive use of polytonality, using two or more tonal centers simultaneously. An example is Prokofiev's Visions Fugitives. A group of Russian composers known as the "Russian Five" also infused folk themes into their works.
- Composers experimented with electronic devices, musique concrete using recorded sounds, and chance music incorporating random elements. Pioneers included Varèse, Stockhausen, Cage