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In page Disc jockey:

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Club DJs, commonly referred to as DJs in general, play music at musical events, such as parties at music venues or bars, clubs, music festivals, corporate, and private events. Typically, club DJs mix music recordings from two or more sources using different mixing techniques to produce a non-stopping flow of music. Mixing began with hip hop in the 1970s and would subsequently expand to other genres in especially (but not exclusively) dance music. A DJ who mostly plays and mixes one specific music genre is often given the title of that genre; for example, a DJ who plays hip hop music is called a hip hop DJ, a DJ who plays house music is a house DJ, a DJ who plays techno is called a techno DJ, and so on.[citation needed]