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Company typePrivate
IndustryVideo games
Computer software
FoundedLondon, U.K. (2008 (2008))
FounderMichael Breidenbruecker
Area served
Key people
Michael Breidenbruecker
(CEO and founder)
Robert Thomas
(Chief Creative Officer)
Christian Haudum
  • "Inception The App"
  • "Dark Knight Rises Z+"
  • "Dimensions The Game"
  • "Rj Voyager"
Number of employees

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.[1]

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.[2] Reactive music is closely connected to generative music, interactive music, and augmented reality. Similar to music in video games, 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, microphone, accelerometer, touch-screen 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.[3]

What is distributed in reactive music is not the music itself, but software that generates the music.[4] Applications made by RjDj were available on Apple’s iOS platform. The technology behind it was based on the Pure Data (or Pd) digital signal processing framework. Reactive music pieces, so called Scenes, could be made using rjlib,[5] 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[edit]

  • RjDj[6]
  • RjDj Shake
  • Love by Air[7]
  • Inception – The App[8]
  • Kids on DSP – reactive minimal techno[9]
  • Little Boots – Reactive Remixer[10]
  • Dimensions – The Game[11]
  • Rj Voyager[12]
  • MusicZones[13]
  • Trippy [14]
  • Dark Night Rises Z+[15]
  • The app formerly known as H _ _ r[16]

Artists who have released music as RjDj apps[edit]

YouTube videos[edit]

  • [1] – Dimensions – from the makers of Inception The App
  • [2] – Hans Zimmer about Inception The App
  • [3] – Inception The App – Sleep Dream Review
  • [4] – RjDj Rj Voyager featuring Booka Shade
  • [5] – Little Boots Reactive Remixer iPhone app tutorial


  1. ^ Waldner, F.; Zisfkovits, M.; Lauren, L.; Heidenberger, K. (7 September 2011), "Cross-Industry Innovation: The Transfer of a Service-Based Business Model from the Video Game Industry to the Music Industry", 2011 International Conference on Emerging Intelligent Data and Web Technologies, Emerging Intelligent Data and Web Technologies (EIDWT), 2011 International Conference on, IEEE, pp. 143–147, doi:10.1109/EIDWT.2011.30, ISBN 978-1-4577-0840-4, S2CID 15948523
  2. ^ Barnard; et al. (2009). iPhone User Interface Design Projects. New York: Apress. pp. 235–238. ISBN 978-1430223597.
  3. ^ Sterling, Bruce. "Augmented Reality: RjDj". Wired. Retrieved 11 December 2012.
  4. ^ Burton, Charlie (January 2010). "Mod your sounds with RjDj". Wired UK. Vol. 01–10.
  5. ^ (n.a.). "rjlib". GitHub. Retrieved 11 December 2012.
  6. ^ Kincaid, Jason (13 October 2008). "RjDj Generates An Awesome, Trippy Soundtrack For Your Life". Techcrunch. Retrieved 31 October 2012.
  7. ^ (n.a.). "New 'LOVE BY AIR' iPhone App Invites Fans of the French Music Duo To Create Unique Sounds". EMI Music. Archived from the original on 10 May 2012. Retrieved 31 October 2012.
  8. ^ (n.a.). "Inception The App". Remote Control Productions, Warner Bros. & Reality Jockey Ltd. Archived from the original on 3 November 2012. Retrieved 31 October 2012.
  9. ^ (n.a.). "First iPhone-only album to be released by Kids On DSP – video". NME. Retrieved 31 October 2012.
  10. ^ Cutler, Kim-Mai (16 December 2009). "The future of the music album? Check out RjDj's Little Boots app". Venturebeat. Retrieved 31 October 2012.
  11. ^ Geere, Duncan. "RjDj's New App Dimensions Turns Music Discovery Into 'Sonic Adventure Game'". Wired. Wired Magazine. Retrieved 31 October 2012.
  12. ^ Van Buskirk, Eliot. "iPad Could Boost Interactive Music". Wired. Retrieved 31 October 2012.
  13. ^ (n.a). "Music Zones by RjDj". Reality Jockey Ltd. Archived from the original on 23 June 2012. Retrieved 31 October 2012.
  14. ^ (n.a.). "Trippy Replay". Laptoprockers.com. Retrieved 31 October 2012.
  15. ^ Geere, Duncan. "The Dark Knight Rises Soundtrack Gets Augmented by RjDj App". Wired. Wired UK. Retrieved 31 October 2012.
  16. ^ "H _ _ r". hearapp.io. Retrieved 21 September 2016.
  17. ^ Salmon, Chris (3 September 2009). "Click to download: Pump up the volume". The Guardian. Retrieved 11 December 2012.