The JDK Band is a Heavy Metal band centered on Tomohiko Kishimoto. The band was formed for the very purpose of arranging and performing music for and from Falcom games. Since Presence Project (Falcom Special Box ''90), and from Ys 3 JDK Special in 1990 to Ys 5 Image Album in 1996, they participated to 19 albums and created or contributed to ~100 songs. They also participated in Game Music Festivals concerts in 1992 and 1993. The band broke up in 1996.

Members:
Tomohiko Kishimoto (Lyrics, Compose, Arrange, Bass, Guitar, Vocal, Synthesizer & Drum Programming)
Matsukawa Junichiro (Guitar)
Kusakabe Masanori (Guitar)
Takanashi Yasuharu (Keyboards)
Tamamura Fuyuki (Drums)
Komagata Hiroyuki (Guitar)
Shirota Kazuhide (Guitar)

Saikawa Rumi (Vocal)
Yamashita Yayoi (Lyrics, Vocal)
Nagaori Yuka (Lyrics, Vocal)

There was a new JDK Band formed in 2007

Members:
Mikihito Tanaka (Guitar)
Masaru Teramae (Guitar)
Ren Ohara (Violin)
Maiko Kawahara (Keyboard)
Atsushi Enomoto (Bass)
Norisuke Yoshikawa (Drum)

Later, four more members were listed on the booklet of Falcom jdk Band 2008 Spring and Ys SEVEN ORIGINAL SOUND TRACK MINI;

Miki Sumiya (Vocal)
Yukihiro Jindo (Arrangement)
Akiko Nagano (Violin)
Kotarow Hatanaka (Drums)