Electronic music refers to music that emphasizes the use of electronic musical instruments or electronic music technology as a central aspect of the sound of the music. Historically, electronic music was considered to be any music created with the use of electronic musical instruments or electronic processing, but in modern times, that distinction has been lost because almost all recorded music today, and the majority of live music performances, depend on extensive use of electronics. Today, the term electronic music serves to differentiate music that uses electronics as its focal point or inspiration, from music that uses electronics mainly in service of creating an intended production that may have some electronic elements in the sound but does not focus upon them. "Purely electronic music is created through the generation of sound waves by electrical means. This is done without the use of traditional musical instruments or of sounds found in nature, and is the domain of computers, synthesizers and other technologies" (Holmes 2002, 6).
Contemporary electronic music expresses both art music forms including electronic art music, experimental music, musique concrète, and others; and popular music forms including multiple styles of dance music such as techno, house, trance, electro, breakbeat, drum and bass, synth pop, etc.
A distinction can be made between instruments that produce sound through electromechanical means as opposed to instruments that produce sound using electronic components. "The stuff of electronic music is electrically produced or modified sounds. ... two basic definitions will help put some of the historical discussion in its place: purely electronic music versus electroacoustic music" (Holmes 2002, 6).
Examples of electromechanical instruments are the teleharmonium, Hammond B3, and the electric guitar, whereas examples of electronic instruments are a Theremin, synthesizer, and a computer. "Electroacoustic music uses electronics to modify sounds from the natural world. The entire spectrum of worldly sounds provides the source material for this music. This is the domain of microphones, tape recorders and digital samplers... can be associated with live or recorded music. During live performances, natural sounds are modified in real time using electronics. The source of the sound can be anything from ambient noise to live musicians playing conventional instruments" (Holmes 2002, 8).
