Generative music is a term popularized by Brian Eno to describe music that is ever-different and changing, and that is created by a system.
There are four primary perspectives on generative music (Wooller, R. et al., 2005) (reproduced with permission):
Music composed from analytic theories that are so explicit as to be able to generate structurally coherent material (Loy and Abbott 1985; Cope 1991). This perspective has its roots in the generative grammars of language (Chomsky 1956) and music (Lerdahl and Jackendoff 1983), which generate material with a recursive tree structure.
Music generated by a system component that has no discernible musical inputs. That is, "not transformational" (Rowe 1991; Lippe 1997:34; Winkler 1998). The Koan software by SSEYO – used by Brian Eno to create Generative Music 1 – is an example of this.
Music generated by processes that are designed and/or initiated by the composer. Steve Reich's It's Gonna Rain and Terry Riley's In C are examples of this (Eno 1996).
Non-deterministic music (Biles 2002), or music that cannot be repeated, for example, ordinary wind chimes (Dorin 2001). This perspective comes from the broader generative art movement. This revolves around the idea that music, or sounds may be "generated" by a musician "farming" parameters within an ecology, such that the ecology will perpetually produce different variation based on the parameters and algorithms used. An example of this technique is Joseph Nechvatal's Viral symphOny: a collaborative electronic noise music symphony created between the years 2006 and 2008 using custom artificial life software based on a viral model.
Many software programs have been written to create generative music, including:
SSEYO Koan Pro (1994–2007), used by Brian Eno to create his hybrid album Generative Music 1. The SSEYO Koan software was created by Pete Cole and Tim Cole of Intermorphic, who re-acquired the Koan technology in 2008. The software was displayed in the London Science Museum's Oramics exhibition (2011-2012) [1]
Intermorphic's Noatikl (2007–present). Noatikl is described by Intermorphic as "The Evolution of Koan", and was launched in 2007 as a replacement for the no-longer-available Koan. Noatikl is a generative music engine that generates MIDI events in accordance with a rule set that can be manipulated in real-time through a graphical user interface. Noatikl can operate as a Hyperinstrument by responding to incoming MIDI event data, with optional extension through user-supplied Lua scripts. Noatikl is available as a standalone tool for iOS, macOS and Windows, and there are VST and AU plug-ins for desktop music sequencers. Noatikl 2 was released in May 2012. Noatikl 3 for iOS, macOS and Windows was released in November 2015.
Intermorphic's Mixtikl (2004–present), a portable generative music lab and loop mixing system with variants for iOS, iPad, Android, macOS and Microsoft Windows, as well as VST and Audio Unit plug-ins for desktop music sequencers. Mixtikl includes an embedded Noatikl generative music engine and Noatikl editor, and the Partikl modular synthesizer system. Mixtikl 7 for iOS, Android, macOS and Windows was released in November 2015.
Intermorphic's Wotja (2014–present). Wotja is an app for iOS, which uses an integrated Noatikl music engine to allow a user to generate text-driven generative music messages.
Intermorphic's Tiklbox (2012–present). Tiklbox is an app for iOS, which uses an integrated Noatikl music engine to create ambient generative music, to assist in relaxation and reflection.
IMPROVISOR for AudioCubes IMPROVISOR for Audiocubes, used by Mark Mosher and other electronic music composers. IMPROVISOR and Audiocubes were created by Bert Schiettecatte of Percussa.
FractMus, developed by Gustavo Díaz-Jerez is a real-time algorithmic music generator.
Bronze a new format for recorded music that reinterprets the piece on each listening. created by Gwilym Gold and Lexx and released on macOS and iOS
Tune Smithy, developed by Robert Walker, for Windows generates music real time using a musical construction similar to the Koch snowflake fractal.
Nodal (2007–present), a graph-based generative composition system for real-time MIDI sequence generation (for macOS and Windows)
Bubble Harp developed 1997-2011 by Scott Snibbe for the iPad, iPhone, and iPod Touch.
Bloom developed 2008 by Peter Chilvers together with Brian Eno for the iPhone and iPod Touch.
Karlheinz Essl's sound environments fLOW (1998–2004) and SEELEWASCHEN (2004)
Metascore (Sorensen, Brown and Hedemann 2008) supports the generative composition of music to video timing cues.
MusiGenesis (2005), a generative music program for Windows.
Lauri Gröhn has developed Synestesia software that generates music (midi file) from any photos in a few seconds.
Many algorithmic music projects are also considered to be generative (see algorithmic.net for some of them).
Modern generative music games such as Rez have been considered generative in character.
Sergio Maltagliati generative music software [2].
Kepler's Orrery, an interactive gravity simulator that generates music, developed in 2007 as an open-source Java project and ported to the iPhone in 2009.
Dub Cadet, is the generative arduino based software and hardware interface for creating music through rotational motion developed by Noah Hornberger in 2012.
'Scape' (software) app developed by Brian Eno and Peter Chilvers for the iPod in 2012.
Capture is a generative rock band based on emergent and procedural software. Capture generates pop music, lyrics, images and videos 24/7 on the web. (see chatonsky.net for more info).
Loligo image-based development environment for generative music, developed 2014 by Vanja Cuk
Generative a MaxMSP-based application designed to create continually evolving soundscapes and drones, second version released in 2015 by Michael Sweeton.
StyleMachineLite a MAX for Live application by Canadian company Metacreative, released in 2015.
Staggered Laboratories is a generative development collective focused on melodic compositions that writes their own customized software and produces endless 24/7 audio streams in the pop and electronica genres.
Quasi Art - automatic program for generation quasi music (algorithm by Lois Alexandre, released 2016). The program creates unimaginable and bizarre orchestral melodies created programmatically using the built-in synthesizer in realtime.
