Spratleys Japs was a British psychedelic rock band formed by Cardiacs leader Tim Smith and Joanne Spratley. The band is known to have been inspired by the sound of a malfunctioning Mellotron loaned to Tim Smith by Planet Mellotron coordinator Andy Thompson. The Mellotron is used extensively on the Spratleys Japs recordings. (It has since been repaired). The band's lineup was Tim Smith (bass guitar, vocals, Mellotron), Joanne Spratley (vocals, flugelhorn, Theremin), Heidi Murphy (electronics devices and synthesisers), Mark Donovan (guitar) and Viv Sherriff (drums).

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