This cover designed by Naoki Kawana.
JBK was Takafumi Matumoto(prog,sample,compose,syn,per) and Naoking Kawana(voice,sample,ios app playing,per)

Danna-Summer ver.1 (music by JBK )

Takafumi Matumoto(prog,sample edit,conpose,mix,syn,per)
Naoking Kawana(sample sause,ios app playing,per,cover art)

JayT (ver.110612 16bit44.1kh, music by JBK )

Takafumi Matumoto(prog,sample,mix,syn ,per)
Naoking Kawana(voice,sample,ios app playing,cover art)

Takafumi Matumoto(conpose,prog,sample,syn),
Naoking Kawana(sample,whistling,cover art)

JBKMT as Takafumi Matumoto (Onnes Project Records / PeaceJam / 楽縁祭)
DJ,Trackmaking,per,sounds tec suport,etc