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Jason Paul McCaslin, better known as "Cone," is the bass guitarist and backup vocalist of Canadian band Sum 41 Born in Toronto, Ontario, on September 3, 1980, and he joined the band as the last member of its current lineup in February 1999, replacing Mark Spicoluk. Sum 41 was signed by Island Records only months after he joined.

McCaslin began playing bass when he was 14 as a member of a grunge garage band (Second Opinion) with Avril Lavigne's former drummer Matt Brann and other neighbors. He was the last musician to join, and because the other band members had already chosen their instruments, he was left with no choice but to play the bass.

Before joining Sum 41, he was an usher at a movie theatre. He supposedly acquired the nickname "Cone" from fellow band member Deryck Whibley in high school because he frequently ate ice cream cones at lunch.

In Sum 41, Cone was the most frequently visible member of the band, often speaking to the public and answering questions on the band's official website.

Cone has started a side project called The Operation M.D., with Todd Morse (Juliette and The Licks, H20) in 2002, but only started work on it recently. The Operation M.D. have demos on their MySpace and their debut album, We Have an Emergency was released on February 20, 2007 by Aquarius Records. His nickname in the band is Dr. Dynamite.

He provides lead vocals for 3 songs, including "Someone Like You", which will be appearing on the debut record.

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