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In this photo posted by John Mayer, his Grado Labs SR325e Headphones can be seen beside his [PRS guitar](http://equipboard.com/pros/john-mayer/prs-super-eagle). He says, "Fun way to start the day, to wake up and listen to Grateful Dead tunes and get warmed up for tonight's @deadandcompany performance on @jimmykimmellive. It's gonna be a blast. Check it out..." (Instagram source [here](https://www.instagram.com/p/BFPWuaDuEcW/))more
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