In the 1950s and 1960s, television began to play an increasingly important role in disseminating new popular music. Variety shows regularly showcased popular singers and bands. In the 1960s, the development of new technologies in recording such as multitrack recorders gave sound engineers an increasingly important role in popular music. By using recording techniques, sound engineers could create new sounds and sound effects that were not possible using traditional "live" recording techniques.
In the 1970s, the trend towards consolidation in the recording industry continued to the point that the "... dominance was in the hands of five huge transnational organizations, three American-owned (WEA, RCA, CBS) and two European-owned [companies] (EMI, Polygram)". In the 1990s, the consolidation trend took a new turn: inter-media consolidation. This trend saw music recording companies being consolidated with film, television, magazines, and other media companies, an approach which facilitated cross-marketing promotion between subsidiaries. For example, a record company's singing star could be cross-promoted by the firm's television and magazine arms.
In the 1990s, popular music was changed by the "introduction of digital equipment (mixing desks, synthesizers, samplers, sequencers)" which allowed the creation of "new sound worlds" and facilitated DIY music production by amateur musicians and " tiny independent record labels". Another trend which affected popular music was the increasing availability and use of computers and Internet connections, which facilitated the dissemination—both legal and illegal—of digital recordings and digital versions of sheet music and lyrics.
(extract from Wikipedia 2011)
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