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John Mayer is known to be a pretty off-the-cuff guy, but the rocker remained low-key, yet plugged in to some tunes, while cruising through LAX.

Wearing a plaid shirt, sexy leather jacket and shades, Mayer kept to himself while listening to, what appears to be, a clear radio earpiece. So THAT'S what kept him occupied.

Whether he's being crazy, or a little on the quiet side, there's something about this guy that makes us smile.