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                                                    dj WHAT IS A DJ?

A disc jockey, also known as DJ, is a person who selects and plays recorded music for an audience.
The raw material is the sound.

 There are several types of disc jockeys:
- Radio DJs introduce and play music that is broadcast on AM, FM, shortwave, digital or internet radio stations.

- Club DJs select and play music in bars, nightclubs, at parties, or even in stadiums.

- Hip-hop DJs select and play music using multiple turntables (a device for playing sound recordings), and they may also do and effect called turntable scratching to create percussive sounds.

- In reggae (music genre developed in Jamaica in the late 1960s), the DJ (deejay) is a vocalist who raps, "toasts", or chats over pre-recorded rhythm tracks.

- Mobile DJs travel with portable sound systems and play recorded music at a variety of events.
                                      dj WHICH SOUND EFFECTS MAKES A DJ?

Several techniques are used by DJs as a means to better mix and blend recorded music.

The complexity and frequency of special sound effects 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.

Some essential sound effects for a DJ are:

FADE: a gradual increase or decrease in the level of a sound.
A recorded song may be gradually reduced to silence at its end (fade-out), or may gradually increase from silence at the beginning (fade-in).

Listen to a Fade in

in

Listen to a Fade out

out

REVERB: the persistence of sound in a particular space after the original sound is produced.
It is created when a sound is produced in an enclosed space causing a large number of echoes (singular echo: a reflection of sound, arriving at the listener some time after the direct sound) to build up and then slowly decay as the sound is absorbed by the walls and air.

Listen to a Reverb
reverb
Listen to an Echo
echo

Club DJ needs to preserve energy on a dancefloor and uses sound effects like:

BEATMATCHING: is a DJ technique of  PITCH SHIFTING (the original pitch of a sound is raised or lowered) or TIMESTRETCHING (change the speed or duration of a sound without affecting its pitch) when two records are played simultaneously.

Listen to a Beatmatch effect

beat

SCRATCHING: is a DJ techinque used to produce distinctive sound by moving a record back and forth on a turntable. 

Listen to a Scratch effect here

scratch
There are more DJ techniques, would you like to know them?     
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