Jason "Cone" McCaslin (born 3 September 1980) is a Canadian musician, singer, songwriter, and record producer, serving as the bassist and backing vocalist of the band Sum 41.
McCaslin began playing bass at the age of 14, as a member of a grunge garage band called Second Opinion.
He is of Irish/Swedish descent.
He acquired the nickname "Cone" from fellow band member Deryck Whibley in high school, because he frequently ate ice cream cones at lunch.

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