Martyn Paul Casey (born 10 July 1960) is an English-born Australian rock bass guitarist. He has been a member of the Triffids, Nick Cave and the Bad Seeds and Grinderman. Casey plays either his Fender Precision Bass or Fender Jazz Bass.
Martyn Paul Casey was born in Chesterfield, Derbyshire, England on 10 July 1960 and has a twin brother Mark. Casey's original band was called The Nobodies which was formed in February 1980, with Matthew Stirling (Matthew de la Hunty, later of Tall Tales and True) on guitar and Steve Eskine on drums (this line-up of the band released a cassette of their recordings). In early 1981 he left The Nobodies and played in a reggae band, A2Z. When not touring he lives in Fremantle with his wife and children where he plays with The Painkillers.
Casey joined The Triffids in September 1982 replacing bassist Byron Sinclair. With the band, he recorded their second EP, Bad Timing and Other Stories in October. It was issued by Mushroom Records in April 1983. Mushroom let the band go shortly after its release. The group then saved money from support slots with the Hoodoo Gurus, The Church and Hunters and Collectors, to record and release their debut 12-inch vinyl album, Treeless Plain, for Hot Records, a newly established Sydney-based independent label.

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