John Spiker is an American musician primarily known for being the bassist for Tenacious D since 1999, and for the Industrial Rock band Filter from 2008 to 2010. He currently plays guitars and keys with Ronnie Vannucci's band Big Talk.
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Buy Discography: 
| Play | Soundtrack | Movie/Serie | Type | Buy song | |
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| Car Chase City | Tenacious D in The Pick of Destiny | performer |
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| Caveman | Tenacious D in The Pick of Destiny | performer |
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| Happy Together | The Stepfather | producer |
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| Happy Together | Macabre | producer |
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| I Think I Love You | The Croods: A New Age | producer |
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| I Wanna Know | Tenacious D in The Pick of Destiny | writer |
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| Bread and Butter | Let's Kill Ward's Wife | writer, performer |
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| Chain Reaction | Let's Kill Ward's Wife | performer, writer |
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| Creature of Habit | Let's Kill Ward's Wife | performer, writer |
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| Jyne | Tenacious D in The Pick of Destiny | writer |
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| Peaches | The Super Mario Bros. Movie | writer |
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| So Much More | Let's Kill Ward's Wife | writer, performer |
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| Stay Tonight | Let's Kill Ward's Wife | writer, performer |
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| Summer Song | Let's Kill Ward's Wife | writer, performer |
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| The Quest | Tenacious D in The Pick of Destiny | writer |
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