DJs

A disc jockey (also known as DJ or deejay) is a person who selects and plays recordd music for an audience. There are several types of disc jockeys. Radio DJs introduce and play music that is broadcast on AM, FM, shortwave, digital, or online radio stations. Club DJs select and play music in a bar, club, disco, at a rave, or even in a stadium. Hip-hop disc jockeys select and play music using multiple turntables, often to back up one or more MCs. In reggae, the disc jockey is a vocalist who raps, "toasts", or chats over pre-recorded rhythm tracks while the individual choosing and playing them is referred to as a selector. Mobile disc jockeys travel with portable sound systems and work at a variety of events.

Dj equipment may consist of:

• Sound recordings in a DJ's preferred medium (e.g., vinyl records, compact disks, computer media files, etc.);
• A combination of two devices (or sometimes one, if playback is digital) to play sound recordings, for alternating back and forth to create a continuous playback of music (e.g., record players, compact disc players, computer media players such as an MP3 player, etc.);
• A sound system for amplification or broadcasting of the recordings (e.g., portable audio system, PA system) or a radio broadcasting system;
• A DJ mixer, which is an electronic (usually 2- or 4-channel) mixer with a crossfader used to smoothly go from one song to another, using two or more playback devices;
• Headphones, used to listen to one recording while the other recording is being played to the audience; and
• Optionally, a microphone, so that the DJ can introduce songs and speak to the audience.

Other equipment could or can be added to the basic DJ setup (above), providing unique sound manipulations. Such devices include, but are not limited to:

• Electronic effect units (delay, reverb, octave, equalizer, chorus, etc). Some club DJs use a suboctave effect, which creates a very low bass sound and adds it to the mix.
• A computerised performance system, which can be used with timecode-encoded vinyl/CD content to manipulate digital files on the computer in real time.
• Multi-stylus headshells, which allow a DJ to play different grooves of the same record at the same time.
• Special Dj digital controller hardware can manipulate digital files on a PC or laptop;
• Samplers, sequencers, electronic musical keyboards (synthesizers), or drum machines.

Several techniques are used by DJs as a means to better mix and blend recorded music. These techniques primarily include the curing, equlaization, and audio mixing of two or more sound sources. The complexity and frequency of special techniques depends largely on the setting in which a DJ is working. Radio DJs are less likely to focus on music-mixing procedures than club DJs, who rely on a smooth transition between songs using a range of techniques.

Club DJ turntable techniques include beatmatching, phrasing, and slip-cueing to preserve energy on a dancefloor. Turntablismcutting, beat juggling, scratching, needle drops, phase shifting , back spinning, and more to perform the transitions and overdubs of samples in a more creative manner (although turntablism is often considered a use of the turntable as a musical instrument rather than a tool for blending recorded music). Professional DJs may use harmonic mixing to choose songs that are in compatible musical keys.