birthdate: '0000-12-27'
birthplace: Shizuoka Prefecture, Japan
discography:
- catalog: KICA-1162
  date: '1995-06-21'
  link: album/553
  reprint: false
  roles:
  - Synthesizer
  titles:
    en: PERFECT SELECTION DRACULA BATTLE II
    ja: パーフェクトセレクション ドラキュラ バトル II
    ja-latn: PERFECT SELECTION DRACULA BATTLE II
  type: game
- catalog: KICA-1189
  date: '1996-09-21'
  link: album/865
  reprint: false
  roles:
  - Keyboard
  titles:
    en: PERFECT SELECTION KONAMI BATTLE the BEST
    ja: パーフェクトセレクション　コナミ・バトル・ザ・ベスト
    ja-latn: PERFECT SELECTION KONAMI BATTLE the BEST
  type: game
- catalog: T-2401M
  date: '2000-12-14'
  link: album/15404
  reprint: false
  roles:
  - Arranger
  titles:
    en: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type B
    ja: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type B
    ja-latn: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type B
  type: bonus
- catalog: T-2401M
  date: '2000-12-14'
  link: album/45729
  reprint: false
  roles:
  - Arranger
  titles:
    en: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type A
    ja: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type A
    ja-latn: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type A
  type: bonus
- catalog: T-2401M
  date: '2000-12-14'
  link: album/70661
  reprint: false
  roles:
  - Arranger
  titles:
    en: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type C
    ja: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type C
    ja-latn: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type C
  type: bonus
- catalog: T-2401M
  date: '2000-12-14'
  link: album/70967
  reprint: false
  roles:
  - Arranger
  titles:
    en: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type D
    ja: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type D
    ja-latn: Guilty Gear X [By Your Side "G.Gear"] GGX Extra Type D
  type: bonus
- catalog: FSCA-10164
  date: '2001-01-17'
  link: album/1167
  reprint: false
  roles:
  - Programmer (as HIROSHI SEIYAMA)
  - Keyboard (as HIROSHI SEIYAMA)
  titles:
    en: GUILTY GEAR X HEAVY ROCK TRACKS ~ The Original Sound Track of Dreamcast!!
    ja: GUILTY GEAR X HEAVY ROCK TRACKS ~ The Original Sound Track of Dreamcast!!
    ja-latn: GUILTY GEAR X HEAVY ROCK TRACKS ~ The Original Sound Track of Dreamcast!!
  type: game
- catalog: FSCA-10173
  date: '2001-05-16'
  link: album/1164
  reprint: false
  roles:
  - Composer
  - Arranger
  - Performer
  titles:
    en: Guilty Gear X Rising Force Of Gear Image Vocal Tracks -Side.I ROCK YOU!!-
    ja: Guilty Gear X Rising Force Of Gear Image Vocal Tracks -Side.I ROCK YOU!!-
    ja-latn: Guilty Gear X Rising Force Of Gear Image Vocal Tracks -Side.I ROCK YOU!!-
  type: game
- catalog: FSCA-10174
  date: '2001-05-16'
  link: album/5428
  reprint: false
  roles:
  - Composer
  - Arranger
  - Performer
  titles:
    en: Guilty Gear X Rising Force Of Gear Image Vocal Tracks -Side.II SLASH!!-
    ja: Guilty Gear X Rising Force Of Gear Image Vocal Tracks -Side.II SLASH!!-
    ja-latn: Guilty Gear X Rising Force Of Gear Image Vocal Tracks -Side.II SLASH!!-
  type: game
- catalog: FSCA-10175
  date: '2001-05-16'
  link: album/5429
  reprint: false
  roles:
  - Composer
  - Arranger
  - Performer
  titles:
    en: Guilty Gear X Rising Force Of Gear Image Vocal Tracks -Side.III DESTROY!!-
    ja: Guilty Gear X Rising Force Of Gear Image Vocal Tracks -Side.III DESTROY!!-
    ja-latn: Guilty Gear X Rising Force Of Gear Image Vocal Tracks -Side.III DESTROY!!-
  type: game
- catalog: SCDC-00132
  date: '2001-10-24'
  link: album/8056
  reprint: false
  roles:
  - Music
  titles:
    en: GUILTY GEAR X DRAMA CD VOL.1
    ja: ギルティギアゼクス ドラマCD VOL.1
    ja-latn: GUILTY GEAR X DRAMA CD VOL.1
  type: game
- catalog: SCDC-00137
  date: '2001-12-21'
  link: album/8060
  reprint: false
  roles:
  - Music
  titles:
    en: GUILTY GEAR X DRAMA CD VOL.2
    ja: ギルティギアゼクス ドラマCD VOL.2
    ja-latn: GUILTY GEAR X DRAMA CD VOL.2
  type: game
- catalog: N/A
  date: '2002'
  link: album/155018
  reprint: false
  roles:
  - Arranger
  titles:
    en: Gentei Video / Lapis Lazuli
    ja: 限定ビデオ / Lapis Lazuli
    ja-latn: Gentei Video / Lapis Lazuli
  type: game
- catalog: SCDC-00191~2
  date: '2002-07-24'
  link: album/1172
  reprint: false
  roles:
  - Composer
  - Arranger
  - Keyboard
  titles:
    en: GUILTY GEAR XX original soundtrack
    ja: ギルティギア イグゼクス オリジナルサウンドトラック
    ja-latn: GUILTY GEAR XX original soundtrack
  type: game
- catalog: STF-0011
  date: '2003-01-21'
  link: album/1163
  reprint: false
  roles:
  - Arranger
  titles:
    en: GUILTY GEAR SERIES Best Sound Collection
    ja: ギルティギアシリーズベストサウンドコレクション
    ja-latn: GUILTY GEAR SERIES Best Sound Collection
  type: game
- catalog: KDSD-00001
  date: '2003-03-19'
  link: album/1173
  reprint: false
  roles:
  - Composer
  - Keyboard
  titles:
    en: GUILTY GEAR XX SOUND ALIVE / A.S.H.
    ja: ギルティギア イグゼクス サウンドアライブ / A.S.H.
    ja-latn: GUILTY GEAR XX SOUND ALIVE / A.S.H.
  type: game
- catalog: KDSD-00017~8
  date: '2003-11-06'
  link: album/1169
  reprint: false
  roles:
  - Composer
  titles:
    en: 'GUILTY GEAR XX #RELOAD KOREAN VERSION ORIGINAL SOUND TRACK'
    ja: 'ギルティギア イグゼクス #リロード コリアンヴァージョン オリジナルサウンドトラック'
    ja-latn: 'GUILTY GEAR XX #RELOAD KOREAN VERSION ORIGINAL SOUND TRACK'
  type: game
- catalog: EECA-1012~3
  date: '2004-01-28'
  link: album/149407
  reprint: false
  roles:
  - Arranger
  titles:
    en: Lapis Lazuli THE BEST
    ja: Lapis Lazuli THE BEST
    ja-latn: Lapis Lazuli THE BEST
  type: game
- catalog: KDSD-00038
  date: '2004-05-19'
  link: album/1170
  reprint: false
  roles:
  - Vocal Arranger
  - Arranger
  - Keyboard
  titles:
    en: GUILTY GEAR XX in L.A VOCAL EDITION
    ja: ギルティギアイグゼクス in L.A ヴォーカルエディション
    ja-latn: GUILTY GEAR XX in L.A VOCAL EDITION
  type: game
- catalog: KDSD-00046
  date: '2004-09-23'
  link: album/1171
  reprint: false
  roles:
  - Arranger
  - Keyboard
  titles:
    en: GUILTY GEAR XX in N.Y VOCAL EDITION
    ja: ギルティギアイグゼクス　in N.Y ボーカルエディション
    ja-latn: GUILTY GEAR XX in N.Y VOCAL EDITION
  type: game
- catalog: KDSD-20001~8
  date: '2005-11-23'
  link: album/4345
  reprint: false
  roles:
  - Composer
  - Arranger
  - Keyboard
  titles:
    en: GUILTY GEAR SOUND COMPLETE BOX
    ja: GUILTY GEAR SOUND COMPLETE BOX
    ja-latn: GUILTY GEAR SOUND COMPLETE BOX
  type: game
- catalog: KICM-1191
  date: '2007-01-24'
  link: album/69512
  reprint: false
  roles:
  - Keyboard
  titles:
    en: Sorairo no Tsubasa / Ryoko Shiraishi
    ja: ソラ色のつばさ / 白石涼子
    ja-latn: Sorairo no Tsubasa / Ryoko Shiraishi
  type: anime
- catalog: CTDX-004651
  date: '2009-04-07'
  link: album/12998
  reprint: false
  roles:
  - Composer
  - Arranger
  titles:
    en: Guilty Gear XX Λ Core Plus Soundtrack CD
    ja: Guilty Gear XX Λ Core Plus Soundtrack CD
    ja-latn: Guilty Gear XX Λ Core Plus Soundtrack CD
  type: bonus
- catalog: N/A
  date: '2019-09-12'
  link: album/90314
  reprint: false
  roles:
  - Arranger
  titles:
    en: GUILTY GEAR MEMORIAL RECORD
    ja: GUILTY GEAR MEMORIAL RECORD
    ja-latn: GUILTY GEAR MEMORIAL RECORD
  type: bonus
featured_on:
- catalog: IPH-001
  date: '2009-07-07'
  link: album/14444
  reprint: false
  roles:
  - Composer
  titles:
    en: The Midnight Chiptunes
    ja: The Midnight Chiptunes
    ja-latn: The Midnight Chiptunes
  type: game
- catalog: SBCD-0013
  date: '2015-08-16'
  link: album/85596
  reprint: false
  roles:
  - Composer
  titles:
    en: HACHIBIT 6
    ja: はちビィっと6
    ja-latn: HACHIBIT 6
  type: doujin
info:
  Birthdate: Dec 27
  Birthplace: Shizuoka Prefecture, Japan
  Bloodtype: O+
  Credited works:
  - 24 albums in database
  - 4 products in database
  Credits:
  - 18 arranger
  - 11 keyboard
  - 11 composer
  - 3 performer
  - 3 music
  - 2 sequencing
  - 1 synthesizer
  - 1 programmer
  - 1 vocal arranger
  - 1 sound arranger
  Former Units:
  - link: artist/788
    names:
      en: Naoto Shibata Project
      ja: 柴田直人プロジェクト
  Units: &id001
  - link: artist/2160
    names:
      en: A.S.H.
      ja: A.S.H.
  Variations:
  - names:
      en: Kohichi Seiyama
  - names:
      en: Koh-ichi Seiyama
  - names:
      en: Koichi SEIYAMA
  - names:
      en: Kouichi Seiyama
link: artist/1568
meta:
  added_date: 2007-11-17T17:53
  edited_date: 2022-02-02T17:04
  fetched_date: 2026-01-08T13:49
  ttl: 86400
  visitors: 10281
name: Koichi Seiyama
name_real: 盛山 浩一
name_trans: せいやま こういち
notes: No notes available for this artist.
picture_full: https://media.vgm.io/artists/86/1568/1568-1499444030.jpg
picture_small: https://thumb-media.vgm.io/artists/86/1568/1568-1499444030.jpg
sex: male
twitter_names:
- seiyan_kb
type: Individual
units: *id001
vgmdb_link: https://vgmdb.net/artist/1568?perpage=99999
websites: {}
