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Jacks
Also known as	Nightingale
Origin	Japan
Genres	Psychedelic rock
Years active	1966 (1966)–1968 (1968)

Past members	Yoshio Hayakawa Haruo Mizuhashi Hitoshi Tanino Takasuke Kida

Jacks were a 1960s Japanese psychedelic rock group who released their best known studio album Vacant World in 1968.