John Kastner, born Jean-Guy Kastner is a Canadian musician and composer born in Beaconsfield, Quebec. He is well known as the singer for Montreal hardcore punk band the Asexuals as well as singer-guitarist for Montreal alternative band Doughboys and alternative band All Systems Go!. He is also the manager for the band Men Without Hats.
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Buy Discography: 
| Play | Soundtrack | Movie/Serie | Type | Buy song | |
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| Something About You | She's Out of My League | writer |
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| Going Nowhere | Suck | performer, writer |
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| I'm Coming To Get You | Suck | writer, performer |
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| Moonlight Sonata | Suck | performer |
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| Night After Night | Suck | performer |
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| So Close It Hurts | Suck | writer, performer |
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| Still Bleeding | Suck | performer |
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| Suck | Suck | performer |
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| Sympathy For The Devil | Suck | performer |
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| Take It | Suck | performer, writer |
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| Tell Vicki | Firewall | writer |
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| The Fool | Suck | performer |
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| This Is Your Brain On Drugs | Suck | performer, writer |
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