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洋書雑誌】AUSTRALIAN GUITAR MAGAZINE Vol.41 / JOHN BUTLER ジョン・バトラー – Books Channel Store
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John Butler - Busking His Way to the Big Time - Acoustic Guitar Magazine - July 2014 - Special Focus: Nylon-String Guitars at Amazon's Entertainment Collectibles Store
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Rig Tour: John Butler | MusicRadar
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Guitarists: The Tone of John Butler | guitar TONE OVERLOAD
