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Dan + Shay aren't just touring with Blake Shelton -- they're traveling in the headliner's one-time bus.  The country duo's Dan Smyers tells CMT he and Shay Mooney only recently learned of its history, which was confirmed by a beer can. 

He explains that a while back Shelton visited them on their bus, and remarked that he thought it was one he'd previously used.  It was the color that tipped him off.  Dan says Blake recalled being asked about painting the vehicle and answering by holding up a can of Bud Light, saying, "Paint it this color." 

Smyers says they then "held a beer up to it and it matched.  It's exactly that color.  So Blake wasn't lying." 

Bud Light blue! 

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