Paul D'Amour (born May 12, 1967 in Spokane, Washington) was the original bass guitarist for Tool. His bass sound was recognised by the aggressive picked tone he developed with his Rickenbacker 4001CS, which can clearly be heard on Tool's first full length album, Undertow. Originally a guitar player, D'Amour became Tool's bassist after being introduced to the band by guitarist Adam Jones. Like Jones, D'Amour was in Los Angeles because of his wish to enter the film industry.

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