Beatmatching
Encyclopedia
Beatmatching is a disc jockey
Disc jockey
A disc jockey, also known as DJ, is a person who selects and plays recorded music for an audience. Originally, "disc" referred to phonograph records, not the later Compact Discs. Today, the term includes all forms of music playback, no matter the medium.There are several types of disc jockeys...

 technique of pitch shift
Pitch shift
Pitch shifting is a sound recording technique in which the original pitch of a sound is raised or lowered. Effects units that raise or lower pitch by a pre-designated musical interval are called "pitch shifters" or "pitch benders".-Pitch/time shifting:...

ing or timestretching a track to match its tempo
Tempo
In musical terminology, tempo is the speed or pace of a given piece. Tempo is a crucial element of any musical composition, as it can affect the mood and difficulty of a piece.-Measuring tempo:...

 to that of the currently playing track e.g. the kicks and snares in two house records hit at the same time when both records are played simultaneously. Beatmatching is a component of mixing
Beatmixing
Beatmixing is a disk jockey technique of playing two songs at the same time so that the beats of one song occur at the same time as the other.-History:...

 which employs beatmatching combined with equalization, attention to phrasing and track selection in an attempt to make a single mix that flows together and has a good structure.

The technique was developed to keep the people from leaving the dancefloor at the end of the song. These days it is considered basic among DJs in electronic dance music
Electronic dance music
Electronic dance music is electronic music produced primarily for the purposes of use within a nightclub setting, or in an environment that is centered upon dance-based entertainment...

 genres, and it is standard practice in clubs to keep the constant beat through the night, even if DJs change in the middle.

Beatmatching is no longer considered a novelty, and new digital mixers have made the technique much easier to master.

Technique

The beatmaxing (or beatmatching) technique consists of the following steps:
  1. While a record is playing, beatmatch a new record to it, using headphones for monitoring. Use gain
    Gain
    In electronics, gain is a measure of the ability of a circuit to increase the power or amplitude of a signal from the input to the output. It is usually defined as the mean ratio of the signal output of a system to the signal input of the same system. It may also be defined on a logarithmic scale,...

     (or trim) control on the mixer to match the levels of the two records.
  2. Restart and slip-cue
    Slip-cueing
    Slip-cueing is a turntable-based DJ technique that consists of holding a record still while the platter rotates underneath the slipmat and releasing it at the right moment. This way the record accelerates to the right speed almost immediately, without waiting for the heavy platter to start up...

     the new record at the right time, begin the new record on beat with the record currently playing. Pay attention to track structures; careful phrasing
    Phrasing (DJ)
    In DJing, phrasing, also called stage matching, refers to alignment of phrases of two tracks in a mix. This allows the transition between the tracks to be done without breaking the musical structure....

     can make the mix seamless.
  3. If the beat on the new record hits before the beat on the current record then the new record is too fast, reduce the pitch and manually slow the speed of the new record to bring the beats back in sync.
  4. If the beat on the new record hits after the beat on the current record then the new record is too slow, increase the pitch and manually increase the speed of the new record to bring the beats back in sync.
  5. Continue this process until the two records are in sync with each other, it can be difficult to sync the two records perfectly, so manual adjustment of the records is necessary to maintain the beat synchronization.
  6. Before fading in the new track, check that the beats of two tracks match by listening to both channels together in the headphones, as the sound from the speakers can reach you with a delay.
  7. Gradually, fade in parts of the new track while fading out the old track. While in the mix, ensure that the tracks are still synchronized, adjusting the records if needed.
  8. The fade can be repeated several times, for example, from the first track, fade to the second track, then back to first, then to second again.

Pitch and tempo

The pitch
Pitch (music)
Pitch is an auditory perceptual property that allows the ordering of sounds on a frequency-related scale.Pitches are compared as "higher" and "lower" in the sense associated with musical melodies,...

 and tempo of a track are normally linked together: spin a disc 5% faster and both pitch and tempo will be 5% higher. However, some modern DJ software can change pitch and tempo independently using time-stretching and pitch-shifting
Audio timescale-pitch modification
Time stretching is the process of changing the speed or duration of an audio signal without affecting its pitch.Pitch scaling or pitch shifting is the opposite: the process of changing the pitch without affecting the speed...

, allowing harmonic mixing
Harmonic mixing
Harmonic mixing or key mixing is a DJ's continuous mix between two pre-recorded tracks that are most often either in the same key, or their keys are relative or in a subdominant or dominant relationship with one another....

. This technique is referred to as beatmatching.

History

Beatmatching was invented by Francis Grasso
Francis Grasso
Francis Grasso ) was an American disc jockey from New York City, best known for inventing the technique of slip-cueing and later beatmatching which is the foundation of the modern club DJ's technique.Grasso started his DJ career in 1967 at a New York nightclub called Salvation II...

 in the late 1960s and early 1970s. Initially he was counting the tempo with a metronome
Metronome
A metronome is any device that produces regular, metrical ticks — settable in beats per minute. These ticks represent a fixed, regular aural pulse; some metronomes also include synchronized visual motion...

 and looking for records with the same tempo. Later a mixer was built for him by Alex Rosner which let him listen to any channel in the headphones independently of what was playing on the speakers; this became the defining feature of DJ mixer
DJ mixer
A DJ mixer is a type of audio mixing console used by disc jockeys.The key features that differentiate a DJ mixer from other types of audio mixers are the ability to redirect a non-playing source to headphones and the presence of a crossfader, which allows for an easier transition between two sources...

s. That and turntables with pitch control
Pitch control
A variable speed pitch control is a control on an audio device such as a turntable, tape recorder, or CD player that allows the operator to deviate from a standard speed . The latter term "vari-speed" is more commonly used for tape decks, particularly in the UK...

 enabled him to mix tracks with different tempo by changing the pitch of the cued (redirected to headphones) track to match its tempo with the track being played by ear. Essentially, the technique he originated hasn't changed since.

These days beatmatching is considered central to DJing, and features making it possible are a requirement for DJ-oriented players. In 1978, the Technics SL-1200MK2
Technics SL-1200
The Technics SL-1200 MK2 MK3 MK4 MK5 MK5G M5G MK6 LTD & GLD are a series of turntables manufactured since October 1972 by Matsushita under the brand name of Technics. S means "Stereo", L means "Player". Originally released as a high fidelity consumer record player, it quickly became adopted among...

 turntable was released, whose comfortable and precise sliding pitch control and high torque direct drive
Direct-drive turntable
A direct-drive turntable is one of two main phonograph designs being manufactured today. The other style is the belt-drive turntable. Each name is based upon the type of drive motor used...

 motor made beatmatching easier and it became the standard among DJs. With the advent of the compact disc, DJ-oriented Compact Disc player
Compact disc player
A Compact Disc player , or CD player, is an electronic device that plays audio Compact Discs. CD players are often a part of home stereo systems, car audio systems, and personal computers. They are also manufactured as portable devices...

s with pitch control and other features enabling beatmatching (and sometimes scratching
Scratching
Scratching is a DJ or turntablist technique used to produce distinctive sounds by moving a vinyl record back and forth on a turntable while optionally manipulating the crossfader on a DJ mixer. While scratching is most commonly associated with hip hop music, since the late 1980s, it has been used...

), dubbed CDJ
CDJ
CDJ is a term used to describe a line of CD players from Pioneer Electronics that allow analogue control of music from CDs, usually using an emulated vinyl control surface...

s, were introduced by various companies. More recently, software with similar capabilities has been developed to allow manipulation of digital audio
Digital audio
Digital audio is sound reproduction using pulse-code modulation and digital signals. Digital audio systems include analog-to-digital conversion , digital-to-analog conversion , digital storage, processing and transmission components...

 files stored on computers using turntables with special vinyl records (e.g. Final Scratch
Final Scratch
Final Scratch is a DJ tool created by the Dutch company N2IT with input from Richie Hawtin and John Acquaviva that allows manipulation and playback of digital audio sources using traditional vinyl and turntables...

, M-Audio Torq, Serato Scratch Live) or computer interface (e.g. Traktor DJ Studio, Mixxx
Mixxx
Mixxx is open source digital DJ'ing software that allows an individual to mix music using a personal computer, as a DJ would with a pair of physical turntables. It is specifically suited to the style of mixing known as beatmatching. - Overview :...

, Virtual DJ). Other software including algorithmic beatmatching is Ableton Live
Ableton Live
Ableton Live is a loop-based software music sequencer and DAW for Mac OS and Windows by Ableton. The latest major release of Live, Version 8, was released in April 2009. In contrast to many other software sequencers, Live is designed to be an instrument for live performances as well as a tool for...

, which allows for realtime music manipulation and deconstruction, or Mixmeister, a DJ Mixset creation tool. Freeware software such as Rapid Evolution
Rapid Evolution
Rapid Evolution is a freeware software tool for DJs, providing advanced filtering and searching features suitable for musicians. It can analyze audio files and automatically determine many properties, such as the musical key, beats per minute , beat intensity and ReplayGain. It currently...

 can detect the beats per minute and determine the percent BPM difference between songs.

The change from pure hardware to software is on the rise, and big DJs are introducing new equipment to their kits such as the laptop
Laptop
A laptop, also called a notebook, is a personal computer for mobile use. A laptop integrates most of the typical components of a desktop computer, including a display, a keyboard, a pointing device and speakers into a single unit...

, and dropping the difficulty of carrying hundreds of CDs with them. The creation of the mp3-player allowed DJs to have an alternative tool for DJIng. Limitations with mp3-player DJing equipment has meant that only second generation equipment such as the IDJ2 or the Cortex Dmix-300 have the pitch control that alters tempo and allows for beatmatching on a digital music player. However, recent additions to the Pioneer CDJ family, such as the CDJ-400
CDJ-400
The CDJ-400 is a model in the CDJ-range from Pioneer Corporation that was released in the late 2007. It is similar in size to the CDJ-200, but comes with scratching abilities and effects, can be used as a MIDI controller, as well as being Pioneer's first model to have a USB input with easy access...

, allow mp3-player and other digital storage devices (such as external hard drives and USB memory sticks) to be connected to the CDJ device via USB. This allows the DJ to make use of the beatmatching capabilities of the CDJ unit whilst playing digital music files from the mp3-player or other storage device.
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