Question: For what international computer art subculture did Mark Alan Knight start out his career writing chiptune and module file music for?

Context paragraphs:
Computer art: Computer art is any art in which computers play a role in production or display of the artwork.  Such art can be an image, sound, animation, video, CD-ROM, DVD-ROM, video game, website, algorithm, performance or gallery installation.  Many traditional disciplines are now integrating digital technologies and, as a result, the lines between traditional works of art and new media works created using computers has been blurred.  For instance, an artist may combine traditional painting with algorithm art and other digital techniques.  As a result, defining computer art by its end product can thus be difficult.  Computer art is by its nature evolutionary since changes in technology and software directly affect what is possible.  Notable artists in this vein include Manfred Mohr, Ronald Davis, Harold Cohen, Joseph Nechvatal, George Grie, Olga Kisseleva, John Lansdown, and Jean-Pierre Hébert.

Demoscene: The demoscene is an international computer art subculture that specializes in producing demos: small, self-contained computer programs that produce audio-visual presentations.  The main goal of a demo is to show off programming, artistic, and musical skills.

OS/360 Object File Format: The OS/360 Object File Format is the standard object module file format for the IBM DOS/360, OS/360 and VM/370, Univac VS/9, and Fujitsu BS2000 mainframe operating systems.  In the 1990s, the format was given an extension with the XSD-type record for the MVS Operating System to support longer module names in the C Programming Language.  This format is still in use by the z/VSE operating system (the follow-on to the DOS/360 Operating System).  In contrast, it has been superseded by the GOFF file format on the MVS Operating System (the follow-on to the OS/360 Operating System) and on the z/VM Operating System (the follow-on to the VM/370 Operating System).  Since the MVS and z/VM loaders will still handle this older format, some compilers have chosen to continue to produce this format instead of the newer GOFF format.

Mark Knight (sound designer): Mark Alan Knight (also known as TDK and madfiddler) (born 8 January 1973, in Brighton, East Sussex) is a British video game music composer and sound designer, Chiptune composer, and electric violinist.  He started out writing chiptune and module file music in the Amiga Demoscene, and began his games industry career as a composer in 1992 .  He continued until 2000 when he moved to sound design, and since 2014 has a split role as a sound designer and composer.

ModPlug Player: ModPlug Player is a module file player developed by Olivier Lapicque in conjunction with the original ModPlug Tracker project and the "ModPlug" Browser plugin.  Features include a playlist editor, graphical equalizer, automatic gain control, bass expansion, reverb, Dolby Surround Sound support and the ability to mix two modules simultaneously and to change their pitch and tempo.  The player supports a variety of module music files in both native and compressed (ZIP / RAR / LHA) formats.

Music and artificial intelligence: Research in artificial intelligence (AI) is known to have impacted medical diagnosis, stock trading, robot control, and several other fields.  Perhaps less popular is the contribution of AI in the field of music.  Nevertheless, artificial intelligence and music (AIM) has, for a long time, been a common subject in several conferences and workshops, including the International Computer Music Conference, the Computing Society Conference and the International Joint Conference on Artificial Intelligence.  In fact, the first International Computer Music Conference was the ICMC 1974, Michigan State University, East Lansing, USA

International Computer Music Conference: The International Computer Music Conference (ICMC) is a yearly international conference for computer music researchers and composers.  It is the annual conference of the International Computer Music Association (ICMA).

MOD (file format): MOD is a computer file format used primarily to represent music, and was the first module file format.  MOD files use the “. MOD” file extension, except on the Amiga which doesn't rely on filename extensions, instead it reads a file's header to determine filetype.  A MOD file contains a set of "instruments" in the form of samples, a number of "patterns" indicating how and when the samples are to be played, and a list of what patterns to play in what order.

Fractal art: Fractal art is a form of algorithmic art created by calculating fractal objects and representing the calculation results as still images, animations, and media.  Fractal art developed from the mid-1980s onwards.  It is a genre of computer art and digital art which are part of new media art.  The mathematical beauty of fractals lies at the intersection of generative art and computer art.  They combine to produce a type of abstract art.

International Computer Games Association: The International Computer Games Association (ICGA) was founded as the International Computer Chess Association (ICCA) in 1977 by computer chess programmers to organise championship events for computer programs and to facilitate the sharing of technical knowledge via the ICCA Journal.

Supporting paragraphs: Mark Knight (sound designer) Demoscene
Answer: Demoscene