Laptronica

Live electronic music (also known as live electronics and electroacoustic improvisation) is a form of experimental improvised music. Instruments can include traditional electronic sound-generating devices, modified electric musical instruments, hacked sound generating technologies, and computers. Initially the practice developed in reaction to sound-based composition for fixed media such as musique concrète, electronic music and early computer music. Musical improvisation often plays a large role in the performance of this music. The timbres of various sounds may be transformed extensively using devices such as amplifiers, filters, ring modulators and other forms of circuitry (Sutherland 1994, 157). Real-time generation and manipulation of audio using live coding is now commonplace.

Early electronic instruments intended for live performance, such as Thaddeus Cahill's Telharmonium (1897) and instruments developed between the two world wars, such as the Theremin (1919), Spharophon (1924), ondes Martenot (1928), and the Trautonium (1929), may be cited as antecedents (Manning 2013, 157), but were intended simply as new means of sound production, and did nothing to change the nature of musical composition or performance (Collins 2007, 39).

Many early compositions included these electronic instruments, though the instruments were typically used as fill-ins for standard classical instruments. An example includes composer Joseph Schillinger, who in 1929 composed First Airphonic Suite for Theremin and Orchestra, which premièred with the Cleveland Orchestra with Leon Theremin as soloist.Percy Grainger, used ensembles of four or six theremins (in preference to a string quartet) for his two earliest experimental Free Music compositions (1935–37) because of the instrument's complete 'gliding' freedom of pitch (Gillies and Pear n.d.; Lewis 1991, chapter 4: "Program Notes". The ondes Martenot was also used as a featured instrument in the 1930s, and composer Olivier Messiaen used it in the Fête des Belles Eaux for six ondes, written for the 1937 International World's Fair in Paris (Hill and Simeone 2005, 74–75).

...
Wikipedia