A promotional recording, or promo, is a recording issued on vinyl, CD, cassette tape, VHS, or DVD and distributed free in order to promote a commercial recording. Promos are usually sent out to music radio and television stations. A gramophone record, (also phonograph record - often simply record) is an analog sound recording medium: a flat disc rotating at a constant angular velocity, with inscribed spiral grooves in which a stylus or needle rides. ... Interference colors. ... For the meaning of cassette in genetics, see cassette (genetics). ... Top view VHS cassette with US Quarter for scale Bottom view of VHS cassette with magnetic tape exposed The Video Home System (1976-2006), better known by its acronym VHS, is a recording and playing standard for video cassette recorders (VCRs), developed by JVC (with some of its critical technology... DVD is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ... Music radio is a radio format where music is the primary source of broadcast content on both commercial and non-commercial stations. ...