RjDj (Reality Jockey Ltd.) was a startup founded in late 2008 by last.fm co-founder Michael Breidenbruecker. The company was based in London and was run by a small team of four employees. Its mission was to create sonic experiences specifically designed for the latest generation of personal music players. RjDj produced and distributed a network of mobile applications and sold additional musical content within this network. RjDj developed a new genre of music that it called reactive music, a non-linear form of music that was able to react to the listener and their environment in real-time. Reactive music is closely connected to generative music,

interactive music In video games, adaptive music (also called dynamic or interactive music) is background music whose volume, rhythm or tune changes in response to specific events in the game. History Adaptive music was first used in the video game ''Frogger'' by ...

, and

augmented reality Augmented reality (AR) is an interactive experience that combines the real world and computer-generated content. The content can span multiple sensory Modality (human–computer interaction), modalities, including visual, Hearing, auditory, hap ...

. Similar to music in

video game Video games, also known as computer games, are electronic games that involves interaction with a user interface or input device such as a joystick, game controller, controller, computer keyboard, keyboard, or motion sensing device to gener ...

s, that is changed by specific events happening in the game, reactive music is affected by events occurring in the real life of the listener. Reactive music adapts to a listener and their environment by using built in sensors (e.g.

camera A camera is an optical instrument that can capture an image. Most cameras can capture 2D images, with some more advanced models being able to capture 3D images. At a basic level, most cameras consist of sealed boxes (the camera body), with a ...

microphone A microphone, colloquially called a mic or mike (), is a transducer that converts sound into an electrical signal. Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and pub ...

accelerometer An accelerometer is a tool that measures proper acceleration. Proper acceleration is the acceleration (the rate of change of velocity) of a body in its own instantaneous rest frame; this is different from coordinate acceleration, which is acce ...

touch-screen A touchscreen or touch screen is the assembly of both an input ('touch panel') and output ('display') device. The touch panel is normally layered on the top of an electronic visual display of an information processing system. The display is ofte ...

and GPS) in mobile media players. The main difference to generative music is that listeners are part of the creative process, co-creating the music with the composer. Reactive music is also able to augment and manipulate the listeners real-world auditory environment. What is distributed in reactive music is not the music itself, but software that generates the music. Applications made by RjDj were available on Apple’s iOS platform. The technology behind it was based on the

Pure Data Pure Data (Pd) is a visual programming language developed by Miller Puckette in the 1990s for creating interactive computer music and multimedia works. While Puckette is the main author of the program, Pd is an open-source software, open-source ...

(or Pd) digital signal processing framework. Reactive music pieces, so called ''Scenes'', could be made using rjlib, which is an open source library of useful software building blocks to construct reactive music. RjDj closed its website and removed its apps from circulation in 2013.

Apps Developed

* RjDj * RjDj Shake * Love by Air * Inception – The App * Kids on DSP – reactive minimal techno * Little Boots – Reactive Remixer * Dimensions – The Game * Rj Voyager * MusicZones * Trippy * Dark Night Rises Z+ * The app formerly known as H _ _ r

Artists who have released music as RjDj apps

ookoi
*

Carl Craig Carl Craig (born May 22, 1969) is an American electronic music producer, DJ, and founder of the record label Planet E Communications. He is known as a leading figure and pioneer in the second wave of Detroit techno artists during the late 1980 ...

* Little Boots * Air
Acid Pauli
*

Booka Shade Booka Shade is a German house duo. It is made up of Walter Merziger and Arno Kammermeier, described as veterans of the Frankfurt electronic music scene. They have released 7 studio albums including Memento (2004) Movements (2006), The Sun & The ...

* Jimmy Edgar * Chiddy Bang * Son of Dave * Kirsty Hawkshaw * Venus Hum * Easy Star Allstars * Sophie Barker * Kids on DSP *

Hans Zimmer Hans Florian Zimmer (; born 12 September 1957) is a German film score composer and music producer. He has won two Oscars and four Grammys, and has been nominated for two Emmys and a Tony. Zimmer was also named on the list of Top 100 Living ...

* Netsky

YouTube videos

nbsp;– Dimensions – from the makers of Inception The App

nbsp;– Hans Zimmer about Inception The App

nbsp;– Inception The App – Sleep Dream Review

nbsp;– RjDj Rj Voyager featuring Booka Shade

nbsp;– Little Boots Reactive Remixer iPhone app tutorial

References

{{Reflist Defunct companies based in London Computer music software IOS software British companies established in 2008 Software companies established in 2008 2008 establishments in England British companies disestablished in 2013 Software companies disestablished in 2013 2013 disestablishments in England