WIKIPEDIA - A disc jockey, often abbreviated as DJ, is a person who plays existing recorded music for a live audience. Most common types of DJs include the radio DJ, the club DJ who performs at a nightclub or music festival, and the event DJ.  In the early days, DJ's spun records on a turntable; we call them turntablists.  With the digital revolution came the use of computers and digital audio files being mixed with hardware controllers, hence the term controllerist. The word DJ is used as an all-encompassing term to describe someone who mixes recorded music from any source, including cassettes, CDs or digital audio files on a CDJ or laptop. The title DJ is commonly used by DJs in front of their real names or adopted pseudonyms or stage names.