A master is a term used by a record label to refer to a sound recording fixed in tangible form and from which all subsequent copies of the sound recording are made.
Psychedelic Trance Music
Electronic music became popular as a result of advances in technology (particularly the development of Musical Instrument Digital Interface, or MIDI), and has since blossomed into a bewildering variety of genres including house, techno, trance, breakbeat, hardcore, and ambient.