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John Mayer debuts Martin double-neck acoustic guitar and new song at first gig of US solo tour | MusicRadar
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John Mayer wields ultra-rare Martin double-neck acoustic guitar at first solo arena tour show | Guitar World
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Amazon.com: Martin Guitar OMJM John Mayer Acoustic-Electric Guitar with Hardshell Case, Spruce and Rosewood Construction, Gloss Finish, and 000-14 Fret : Musical Instruments
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