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Dōjin music (同人音楽 doujin ongaku?), also called otokei dōjin (音系同人?) in Japan, is a sub-category of dōjin activity. Dōjin are basically non-official self-published Japanese works which can be based on official products or completely original creations. Such products are sold online on specialized sites, on the author's own sites and in conventions such as the very popular Comic Markets.
Dōjin music isn't a musical genre in itself but is indicative of a particular means of publication. (Similarly the term "indie" in the United States is used in this way.)
Dōjin music consists very often of video game music fan arrangements. Much original Dōjin music also exists, and has been created both for dōjin games and independently, spanning many musical genres such as pop, rock, techno, trance and many more.
By nature, dōjin music is often self-produced, at low cost, by independent artists. Home-studio software is typically advantageous to dōjin music composers, as it is cheaper than studio mastering live instruments. As such, most Dōjin music has a distinct synthetic quality to it. It is common to have one live instrument (such as a guitar) backed up by synthetic orchestrations, though full instrumentation is becoming more and more common in dōjin music, such as orchestral works or dōjin jazz.
Dōjin music artists can be solo or band projects. It is very common for members of different groups to collaborate on an album. Some projects, such as Woodsoft, are collaborations of several artists contributing to a given theme for each of their album releases.
Each member of a group usually have their individual site on which they release their personal works free to download and possibly give updates about their involvement in upcoming albums. Some artists actually never release albums and keep their artistic activity to this free-for-all form. The most productive groups usually release 2 albums a year which are released in summer and winter editions of the Comic Markets conventions and sold for an average of 1000 yen for full length ones. The most involved and popular artists are usually featured on their own group albums but also make guest appearance on other groups' CDs.
Notable dōjin music artists
- Sound Horizon
- Akiko Shikata a soprano singer, composer, arranger, producer and multi-instrumentalist whose songs tend a lot towards experimentalism.
- Team Shanghai Alice, creator of the Touhou Project, is also very famous for the music for the games.
- IOSYS, a well-known dōjin group most commonly recognized for their Touhou arrangements.
- CROW'SCLAW, a popular neoclassical/power metal instrumental dōjin band who is best known for its arrangements of music from the Touhou and Final Fantasy series of games. Lately they have started to sound heavier, influenced by Metalcore and Melodic Death Metal.
- Iron Attack, known also as Iron Chino is one of the most popular neoclassical/power metal/shred artists on the dōuijn scene, he does mostly arranges of Touhou Music, but lately he has started to co-work with dōujin circles known for their original music like Lightning and Dragon Guardian.
- COOL&CREATE, another well-known Touhou music group, well known by the YouTube community for their U.N. Owen was her? remix
- HARDCORE TANO*C and ALiCE'S EMOTiON, two circles organised by REDALiCE focused on electronic dance music, but predominantly Hardcore amongst others. ALiCE'S EMOTiON is focused on anime and game arranges, mostly focusing on REDALiCE's work while HARDCORE TANO*C features a wider range of artists and focuses on original compositions.
- Annabel, who has worked on several anime productions and is famous for works in partnership with musicians like Nagi Yanagi and bermei.inazawa.
- Kishida Kyōdan & THE AKEBOSHI ROCKETS
- Masayoshi Minoshima
- Rekka Katakiri
- Haruka Shimotsuki
- Junka Amaoto
- Michika Kataoka
- Sou Raika
- Imperial Circus Dead Decadence
- Alice Ichitsuki
- Unchiku Company
- Undead Corporation
- Fukami Chie
- Yuyoyuppe. He is BABYMETAL Sound Producer.
- Hige Driver
- Misawa Aki
- Saitama Saisyu Heiki
- Team Nekokan
- Thousand Leaves
- Unlucky Morpheus
- Arte Refact
- Foreground Eclipse
- Barrage Am Ring
- Magnum Opus 
Sometimes, people may rewrite the lyrics of an existing anime song to create a dōjin song, or insert lyrics into an originally instrumental anime track. These type of dōjin songs are called "dōjin lyrics" (同人詞 dōjinshi?). Many dōjin lyrics are written in Japanese, Chinese, and Korean. Moreover, you can find "fandub" of different languages of an ACG song, Game song or Vocaloid song, like English fandub, French Fandub, Spanish fandub, etc. All of these are Dōjin lyrics of different languages.